/**
 * @desc function tableruler()
 * The function tableruler() dynamically adds classes to table rows that
 *   change color upon mouseover.
 */ 
function tableruler() {
	if (document.getElementById && document.createTextNode) {
		var tables=document.getElementsByTagName('table');

		for (var i=0;i<tables.length;i++) {
			if(tables[i].className=='ruler') {
				var trs=tables[i].getElementsByTagName('tr');

				for(var j=0;j<trs.length;j++) {
					if(trs[j].parentNode.nodeName=='TBODY' && trs[j].parentNode.nodeName!='TFOOT') {
						trs[j].onmouseover=function(){this.className='ruled';return false}
						trs[j].onmouseout=function(){this.className='';return false}
					}
				}
			}
		}
	}
}