function popupWindow(mypage,myname ,w ,h) {
	var win= null;
	var winl = (screen.width-w)/2;
	var wint = (screen.height-h)/2;
	var settings  ='height='+h+',';
	    settings +='width='+w+',';
	    settings +='top='+wint+',';
	    settings +='left='+winl+',';
	    settings +='scrollbars=yes,';
	    settings +='resizable=no';
	win = window.open(mypage, myname, settings);
}