function openwin(url,wintype)

{

newwin = window.open(url, wintype,'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width=900,height=700');

var windowX = (screen.width/2)-450;
var windowY = (screen.height/2)-350;

newwin.moveTo(windowX,windowY);

}