function openWin(sUrl) {
  var w=screen.availWidth;
  var h=screen.availHeight;
  var pw=screen.availWidth/2-425;
  var ph=screen.availHeight/2-350;
  if(w>800)w=850;
  if(h>600)h=625;
  tourwin=window.open(sUrl,'TOURIMG','menubar=0,toolbar=0,scrollbars=1,resizable=1,status=0,width='+(w)+',height='+(h)+',screenX='+pw+',screenY='+ph+',left='+pw+',top='+ph);
}