var windowName 

function popWindow(url,x,y) {

closepopWindow();

var options = "toolbar=0,scrollbars=0,resizable=0,width=" + x + ",height=" + y +",left=85,top=85";
windowName=window.open(url,"popwindow",options);
windowName.focus();
}


function closepopWindow(){
	if (windowName && !windowName.closed){
		windowName.close();
	}
}