function openWin(url,name,wid,hgt){
var sw=(screen.width-wid)/2;
var sh=(screen.height-hgt)/2;
var newwin=window.open(url,name,'width='+wid+',height='+hgt+',top='+sh+',left='+sw+',scrollbars=0,menubars=0,toolbars=0,directories=0,location=0,address=0');
newwin.focus();
}