function popup(url, windowwidth, windowheight) {
	var y = parseInt((window.screen.availWidth - windowwidth)/2);
	var x = parseInt(((window.screen.availHeight - windowheight)/2) * .9);
	eval("detailswindow \= open\(url, \"details\", \"screenX="+x+", screenY="+y+", top="+x+", left="+y+", toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=yes, resizable=yes, width="+windowwidth+", height="+windowheight+"\")");
}