/*
 *  these three functions are the ones that will be used in the markup
 */
function roundAllCorners(selector, backgroundColor, radius) {
	if(!ensureCompatability())
		return;

	var elementArray = document.getElementsBySelector(selector);

	if(elementArray == null)
		return;

	for(var i = 0; i < elementArray.length; i++) {
		drawTopCorners(elementArray[i],backgroundColor,radius);
		drawBottomCorners(elementArray[i],backgroundColor,radius);
	}
}
function roundTopCorners(selector, backgroundColor, radius) {
	if(!ensureCompatability())
		return;

	var elementArray = document.getElementsBySelector(selector);

	if(elementArray == null)
		return;

	for(var i = 0; i < elementArray.length; i++) {
		drawTopCorners(elementArray[i],backgroundColor,radius);
	}
}
function roundBottomCorners(selector, backgroundColor, radius) {
	if(!ensureCompatability())
		return;

	var elementArray = document.getElementsBySelector(selector);

	if(elementArray == null)
		return;

	for(var i = 0; i < elementArray.length; i++) {
		drawBottomCorners(elementArray[i],backgroundColor,radius);
	}
}


// helper functions
function ensureCompatability() {
	if(!document.getElementById || !document.createElement)
		return false;

	var userAgent = navigator.userAgent.toLowerCase();

	if(userAgent.indexOf("msie 5") > 0 && userAgent.indexOf("opera") == -1)
		return false;
	
	return true;
}
function drawTopCorners(element,backgroundColor,radius) {
	var container = document.createElement("b");
	container.style.display = "block";
	container.style.clear = "both";
	container.style.backgroundColor = "transparent";

	container.style.marginLeft = "-"+getPadding(element,"Left")+"px";
	container.style.marginRight = "-"+getPadding(element,"Right")+"px";
	container.style.marginBottom = (getPadding(element,"Top") - radius) + "px";

	for(var i = 1; i < radius; i++) {
		var line = document.createElement("b");
		line.style.display = "block";
		line.style.height = "1px";
		line.style.overflow = "hidden";
		line.style.backgroundColor = "transparent";

		line.style.borderStyle = "solid";
		line.style.borderColor = backgroundColor;

		var sideMargin = Math.sqrt(Math.pow(radius,2) - Math.pow(i,2));
		
		line.style.borderTopWidth = "0";
		line.style.borderBottomWidth = "0";
		line.style.borderRightWidth = radius - Math.round(sideMargin) + "px";
		line.style.borderLeftWidth =  radius - Math.round(sideMargin) + "px";

		container.insertBefore(line,container.firstChild);
	}
	element.style.paddingTop = "0";
	element.insertBefore(container,element.firstChild);
}
function drawBottomCorners(element,backgroundColor,radius) {
	var container = document.createElement("b");
	container.style.display = "block";
	container.style.clear = "both";
	container.style.backgroundColor = "transparent";
	
	container.style.marginLeft = "-"+getPadding(element,"Left")+"px";
	container.style.marginRight = "-"+getPadding(element,"Right")+"px";
	container.style.marginTop = (getPadding(element,"Bottom") - radius) + "px";

	for(var i = 1; i < radius; i++) {
		var line = document.createElement("b");
		line.style.display = "block";
		line.style.height = "1px";
		line.style.overflow = "hidden";
		line.style.backgroundColor = "transparent";

		line.style.borderStyle = "solid";
		line.style.borderColor = backgroundColor;

		var sideMargin = Math.sqrt(Math.pow(radius,2) - Math.pow(i,2));

		line.style.borderTopWidth = "0";
		line.style.borderBottomWidth = "0";
		line.style.borderRightWidth = radius - Math.round(sideMargin) + "px";
		line.style.borderLeftWidth = radius - Math.round(sideMargin) + "px";

		container.appendChild(line);
	}
	element.style.paddingBottom = "0";
	element.appendChild(container);
}

function getPadding(element,side){
	var padding = getStyleProperty(element,"padding"+side);
	if(padding==null || !(padding.indexOf("px") >= 0))
		return 0;
	return parseInt(padding);
}

function getStyleProperty(element,property){
	if(element.currentStyle)
		return(element.currentStyle[property]);
	if(document.defaultView.getComputedStyle)
		return(document.defaultView.getComputedStyle(element,'')[property]);
	return null;
}
/*
   The following code is Copyright (C) Simon Willison 2004.

   document.getElementsBySelector(selector)
   - returns an array of element objects from the current document
     matching the CSS selector. Selectors can contain element names, 
     class names and ids and can be nested. For example:
     
       elements = document.getElementsBySelect('div#main p a.external')
     
     Will return an array of all 'a' elements with 'external' in their 
     class attribute that are contained inside 'p' elements that are 
     contained inside the 'div' element which has id="main"

   New in version 0.4: Support for CSS2 and CSS3 attribute selectors:
   See http://www.w3.org/TR/css3-selectors/#attribute-selectors

   Version 0.4 - Simon Willison, March 25th 2003
   -- Works in Phoenix 0.5, Mozilla 1.3, Opera 7, Internet Explorer 6, Internet Explorer 5 on Windows
   -- Opera 7 fails 
*/

function getAllChildren(e) {
  // Returns all children of element. Workaround required for IE5/Windows. Ugh.
  return e.all ? e.all : e.getElementsByTagName('*');
}

document.getElementsBySelector = function(selector) {
  // Attempt to fail gracefully in lesser browsers
  if (!document.getElementsByTagName) {
    return new Array();
  }
  // Split selector in to tokens
  var tokens = selector.split(' ');
  var currentContext = new Array(document);
  for (var i = 0; i < tokens.length; i++) {
    token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');;
    if (token.indexOf('#') > -1) {
      // Token is an ID selector
      var bits = token.split('#');
      var tagName = bits[0];
      var id = bits[1];
      var element = document.getElementById(id);
      if (tagName && element.nodeName.toLowerCase() != tagName) {
        // tag with that ID not found, return false
        return new Array();
      }
      // Set currentContext to contain just this element
      currentContext = new Array(element);
      continue; // Skip to next token
    }
    if (token.indexOf('.') > -1) {
      // Token contains a class selector
      var bits = token.split('.');
      var tagName = bits[0];
      var className = bits[1];
      if (!tagName) {
        tagName = '*';
      }
      // Get elements matching tag, filter them for class selector
      var found = new Array;
      var foundCount = 0;
      for (var h = 0; h < currentContext.length; h++) {
        var elements;
        if (tagName == '*') {
            elements = getAllChildren(currentContext[h]);
        } else {
            elements = currentContext[h].getElementsByTagName(tagName);
        }
        for (var j = 0; j < elements.length; j++) {
          found[foundCount++] = elements[j];
        }
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      for (var k = 0; k < found.length; k++) {
        if (found[k].className && found[k].className.match(new RegExp('\\b'+className+'\\b'))) {
          currentContext[currentContextIndex++] = found[k];
        }
      }
      continue; // Skip to next token
    }
    // Code to deal with attribute selectors
    if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)) {
      var tagName = RegExp.$1;
      var attrName = RegExp.$2;
      var attrOperator = RegExp.$3;
      var attrValue = RegExp.$4;
      if (!tagName) {
        tagName = '*';
      }
      // Grab all of the tagName elements within current context
      var found = new Array;
      var foundCount = 0;
      for (var h = 0; h < currentContext.length; h++) {
        var elements;
        if (tagName == '*') {
            elements = getAllChildren(currentContext[h]);
        } else {
            elements = currentContext[h].getElementsByTagName(tagName);
        }
        for (var j = 0; j < elements.length; j++) {
          found[foundCount++] = elements[j];
        }
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      var checkFunction; // This function will be used to filter the elements
      switch (attrOperator) {
        case '=': // Equality
          checkFunction = function(e) { return (e.getAttribute(attrName) == attrValue); };
          break;
        case '~': // Match one of space seperated words 
          checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('\\b'+attrValue+'\\b'))); };
          break;
        case '|': // Match start with value followed by optional hyphen
          checkFunction = function(e) { return (e.getAttribute(attrName).match(new RegExp('^'+attrValue+'-?'))); };
          break;
        case '^': // Match starts with value
          checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) == 0); };
          break;
        case '$': // Match ends with value - fails with "Warning" in Opera 7
          checkFunction = function(e) { return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length); };
          break;
        case '*': // Match ends with value
          checkFunction = function(e) { return (e.getAttribute(attrName).indexOf(attrValue) > -1); };
          break;
        default :
          // Just test for existence of attribute
          checkFunction = function(e) { return e.getAttribute(attrName); };
      }
      currentContext = new Array;
      var currentContextIndex = 0;
      for (var k = 0; k < found.length; k++) {
        if (checkFunction(found[k])) {
          currentContext[currentContextIndex++] = found[k];
        }
      }
      // alert('Attribute Selector: '+tagName+' '+attrName+' '+attrOperator+' '+attrValue);
      continue; // Skip to next token
    }
    
    if (!currentContext[0]){
    	return;
    }
    
    // If we get here, token is JUST an element (not a class or ID selector)
    tagName = token;
    var found = new Array;
    var foundCount = 0;
    for (var h = 0; h < currentContext.length; h++) {
      var elements = currentContext[h].getElementsByTagName(tagName);
      for (var j = 0; j < elements.length; j++) {
        found[foundCount++] = elements[j];
      }
    }
    currentContext = found;
  }
  return currentContext;
}

/* That revolting regular expression explained 
/^(\w+)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/
  \---/  \---/\-------------/    \-------/
    |      |         |               |
    |      |         |           The value
    |      |    ~,|,^,$,* or =
    |   Attribute 
   Tag
*/