Código PHP:
<SCRIPT>
var v=parseInt(navigator.appVersion);
isNetscape=navigator.appName.indexOf('Netscape')>=0;
isExplorer=navigator.appName.indexOf('Explorer')>=0;
if(v>=3) self.focus();
function popupWindow() {
ww=screen.width/4; wh=screen.height/3;
positionCode='';
if(v>=4) {
// sw = screen.width; sh = screen.height;
sw = 10; sh = 10;
wbx = Math.round((sw-ww)/10); wby = Math.round((sh-wh)/10);
if(isExplorer) positionCode='left='+wbx+',top='+wby+',';
if(isNetscape) positionCode='screenX='+wbx+',screenY='+wby+',';
}
newWindow1=window.open('1.htm','1','width='+ww+',height='+wh+','+positionCode+'toolbar=0,'+'scrollbars=0,'+'resizable=1');
newWindow2=window.open('2.htm','2','width='+ww+',height='+wh+','+positionCode+'toolbar=0,'+'scrollbars=0,'+'resizable=1');
newWindow3=window.open('3.htm','3','width='+ww+',height='+wh+','+positionCode+'toolbar=0,'+'scrollbars=0,'+'resizable=1');
newWindow4=window.open('4.htm','4','width='+ww+',height='+wh+','+positionCode+'toolbar=0,'+'scrollbars=0,'+'resizable=1');
if(isNetscape && v>=3) newWindow.focus();
}
</SCRIPT>
Algo asi te sirve???