var subWin;
var putItThere = null; 

var sWidth = screen.availWidth;
var sHeight = screen.availHeight;

var w = 0;
var h = 0;

function openIt(picture,w,h) {
        w = parseInt(w)+20;
        h = parseInt(h)+25;
        if (subWin != null && subWin.open)subWin.close();
        subWin = window.open(picture,'pic','width=' + w + ',height=' + h + ',left=' + ((sWidth - w - 10) * .5) + ',top=' + ((sHeight - h - 30) * .5) + ',scrollbars=yes,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no');
		}