function setZebras(){
	var W3CDOM = (document.getElementsByTagName);
	if (!W3CDOM){
	 return;
	}
	var tbls = document.getElementsByTagName('table');
	
	for(var i = 0; i<tbls.length; i++){
		if(tbls[i].className == 'zebra') paintRows(tbls[i].rows);
		
	}
}

function paintRows(oRows){
	var i = 0;
	for(var j= 0; j<oRows.length; j++){
		if (i==0){
			oRows[j].className = 'zebLight';
			i++;
		}else{
		    oRows[j].className = 'zebDark';
			i=0;
		}
	}
}