// http://www.alistapart.com/articles/zebratables/

// this function is needed to work around 
// a bug in IE related to element attributes
function hasClass(obj) {
	if (!obj.getAttributeNode) return false;
	var result = false;
	if (obj.getAttributeNode("class") != null) {
		result = obj.getAttributeNode("class").value;
	}
	return result;
}		


function stripeTables(className) {
	if (!document.getElementsByTagName)	 return;
	
	// the flag we'll use to keep track of 
	// whether the current row is odd or even

	// if arguments are provided to specify the colours
	// of the even & odd rows, then use the them;
	// otherwise use the following defaults:
	var evenColor = arguments[1] ? arguments[1] : "#fff";
	var oddColor = arguments[2] ? arguments[2] : "#eee";

	var arTables = document.getElementsByTagName("TABLE");
	
	for (var t=0; t<arTables.length; ++t) {
		if (arTables[t].className != className) {
			continue;
		}
		
		var even = false;
		
		// by definition, tables can have more than one tbody
		// element, so we'll have to get the list of child
		// &lt;tbody&gt;s 
		var tbodies = arTables[t].getElementsByTagName("tbody");
		
		// and iterate through them...
		for (var h = 0; h < tbodies.length; h++) {
		
		 // find all the &lt;tr&gt; elements... 
			var trs = tbodies[h].getElementsByTagName("tr");
			
			// ... and iterate through them
			for (var i = 0; i < trs.length; i++) {
	
				// avoid rows that have a class attribute
				// or backgroundColor style
				if (!hasClass(trs[i]) && !trs[i].style.backgroundColor) {
			
					// get all the cells in this row...
					var tds = trs[i].getElementsByTagName("td");
				
					// and iterate through them...
					for (var j = 0; j < tds.length; j++) {
				
						var mytd = tds[j];
	
						// avoid cells that have a class attribute
						// or backgroundColor style
						if (!hasClass(mytd) && !mytd.style.backgroundColor) {
							mytd.style.backgroundColor = (even) ? evenColor : oddColor;
						}
					}
				}

				// flip from odd to even, or vice-versa
				even =	! even;
			}
		}
	}
}