var keep_onload = window.onload;
window.onload = function() {
	
	var printBt = document.getElementById('printBt');
	if (printBt != undefined && printBt)
	{
		var d = new Date();
		printBt.href += "?" + d.getTime();
	}
	
	if (keep_onload!=undefined && keep_onload) keep_onload();
}