function popup(url,width,height,scroll) {
	if (typeof scroll == 'undefined' ) scroll = 0;
	
	var popup = "url,\"\",\"status=0, toolbar=0, location=0, menubar=0,directories=0,resizable=0,scrollbars="+scroll+", width="+width+", height="+height+"\""
	
	fullview=window.open(url,"",popup);
	xPos=(screen.availWidth - width)/2;
	yPos=(screen.availHeight - height)/2;
	fullview.moveTo(xPos,yPos);
}