var openwindow = null;

var w = 0;
var h = 0;

function open_popup(location,w,h,sb) {
        
        if (window.screen) {
	        var hori = screen.availWidth;
	        var verti = screen.availHeight;
	        
	        openwindow = window.open(location, 'vote', 'width=' + w + ',height=' + h + ',left=' + ((hori - w - 10) * .5) + ',top=' + ((verti - h - 30) * .5) + ',scrollbars=' + sb);
	}
}