function popUp(url,w,h,resiz,scrolls) { 
var w_avail = screen.availWidth; 
var h_avail = screen.availHeight; 
var top = Math.round ((h_avail - h) * .5); 
var left = Math.round ((w_avail - w) * .5); 

var newWin = window.open(url,newWin,'width=' + w +',height=' +h + ',left=' + left + ',top=' + top + ',resizable=' + resiz + ', scrollbars=' + scrolls + ''); 
newWin.focus();
}

function popNew(url) { 
var newWin = window.open(url); 
newWin.focus();
}