var onloadFunctions = window.onload;
window.onload = function () {
	var lb = document.getElementById('mypopup');
	lb.onclick = function () {
		var url = this.href;
		window.open( url , "_blank", "width=500,height=500,resizable=no,scrollbars=no,status=no,directories=no,location=no,toolbar=no");
		return false;
	}
	onloadFunctions();
}