var win = null;
function centrepop(mypage,myname,w,h,scroll,resize){
leftedge = (screen.width) ? (screen.width-w)/2 : 0;
topedge = (screen.height) ? (screen.height-h)/2 : 0;
settings ='height='+h+',width='+w+',top='+topedge+',left='+leftedge+',scrollbars='+scroll+',resizable='+resize+''
win = window.open(mypage,myname,settings)
}