window.onload = colorRows;
function colorRows() {
       var myTh = document.getElementsByTagName('th');
       for (var i=0;i<myTh.length;i++) {
               if (i%2) {
                       myTh[i].className = 'tablebg01';
               }
			   else{
				   myTh[i].className = 'tablebg03';
				}
       }
	   var myTd = document.getElementsByTagName('td');
       for (var i=0;i<myTd.length;i++) {
               if (i%2) {
                       myTd[i].className = 'tablebg02';
               }
			   else{
				   myTd[i].className = 'tablebg04';
				}
       }
}