var win = null;
function popit(mypage,myname){
h = screen.availHeight;
w = screen.availWidth;
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars=yes,resizable = yes'
win = window.open(mypage,myname,settings)
return win;
}