Is this popup browser freindly?

[sonny]

Hi

I use this for a lot of things, It works for me in FF 9.01 and IE 8, just wondering about
some other browser's, maybe someone experienced with JS can spot something.

PHP Code:

<SCRIPT TYPE="text/javascript">
function popupform(myform, windowname, h, w, p){
if (! window.focus)return true;
window.open('', windowname, 'height='+h+',width='+w+' left='+p+',scrollbars=yes');
myform.target=windowname;
return true;
}
</SCRIPT> 


Thanks
Sonny