// Functions for Striped HTML Tables
// Much of the following code has been blatantly and shamelessly ripped from 
// David F. Miller's article on table-striping featured at A List Apart. See 
// it for yourself at http://alistapart.com/articles/zebratables/

function setupStripeTables( ) {
		// Call any setup functions for extra includes here
		// Typical extra includes include:
		// - tree.js, tree.css for dynamic expandable treeview lists
		// - table.js, table.css for tables with alternating row colors
		stripeTables();
	}
	
function stripeTables( ) {
	var tables = document.getElementsByTagName('table');
	for( var i = 0; i < tables.length; ++i ) {
		if( tables[i].getAttributeNode("class") != null &&
			 tables[i].getAttributeNode("class").value == "zebra" )
		stripe( tables[i] );
	}
}

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

function stripe( table ) {
	// the flag we'll use to keep track of
	// whether the current row is odd or even
	var even = false;

	// 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] : "#faf3ed";

	// by definition, tables can have more than one tbody
	// element, so we'll have to get the list of child
	// <tbody>s
	var tbodies = table.getElementsByTagName("tbody");

	// and iterate through them...
	for(var h = 0; h < tbodies.length; h++) {

		// find all the <tr> 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];
					mytd.style.backgroundColor =
						even ? evenColor : oddColor;
				}
				// flip from odd to even, or vice-versa
				even =  ! even;
			}
		}
	}
}