function openPopUp(url,target,width,height){
	var x = (parseInt(window.screen.width) - width) / 2;
    var y = (parseInt(window.screen.height) - height) / 2;
    var specs = 'width='+width+',height='+height+',menubar=0,resizable=0,scrollbars=0,status=0,toolbar=0';
    var desktop = window.open(url,target,specs);
    desktop.moveTo(x,y);
}