function openWin(url, height, width) {
var w = window.open(url, 'w', 'height=' + height + ', width=' + width + ', status=false, menubar=false, left=0, top=0, scrollbars');
w.focus();
}

function openWin2(url, height, width) {

var sw = screen.availWidth ;
var sh = screen.availHeight ;
var lpos = (sw - width) / 2 ;
var tpos = (sh - height) / 2 ;

var w = window.open(url, 'w', 'height=' + height + ', width=' + width + ', status=false, menubar=false, left='+lpos+', top='+tpos);
w.focus();
}