var popupWin = null;

function showpopup(url)
{
	popupWin = window.open(url, 'showpopup', 'scrollbars,resizable,height=500,innerHeight=500,width=650,innerWidth=650,left=50,top=50,screenX=50,screenY=50');
 	popupWin.focus();
	return false;
}

function closepopup() {
	if (popupWin && popupWin.open && !popupWin.closed) popupWin.close();
}