function open(id) {
if(window.document.getElementById(id).style.display == "none") {
window.document.getElementById(id).style.display = "block";
}
else {
window.document.getElementById(id).style.display = "none";
}
}

function wo(_wurl,_ww,_wh,_wscrl){

/***************
	wurl: window URL
	wh: window height
	ww: window width
	wsr: scrollbars 1 - yes, 0 - no
***************/

 if(screen.width){
  wpos_x = (screen.width-_ww)/2;
  if (wpos_x < 0){ wpos_x = 0;}
  wpos_y = (screen.height-_wh)/2;
  if (wpos_y < 0){ wpos_y = 0;}
 }else{
  wpos_x = 0;
  wpos_y = 0;
 }
 wind_desc = window.open(_wurl,"","alwaysRaised=0,top="+wpos_y+",left="+wpos_x+",height="+_wh+",width="+_ww+",menubar=0,resizable=1,scrollbars="+_wscrl+",status=1");
 wind_desc.focus();
}

<script>
function wo(_wurl,_ww,_wh,_wscrl){

 if(screen.width){
  wpos_x = (screen.width-_ww)/2;
  if (wpos_x < 0){ wpos_x = 0;}
  wpos_y = (screen.height-_wh)/2;
  if (wpos_y < 0){ wpos_y = 0;}
 }else{
  wpos_x = 0;
  wpos_y = 0;
 }
 wind_desc = window.open(_wurl,"","alwaysRaised=0,top="+wpos_y+",left="+wpos_x+",height="+_wh+",width="+_ww+",menubar=0,resizable=1,scrollbars="+_wscrl+",status=1");
 wind_desc.focus();
}
</script>