$("#popup_centering").hide();

function closeme() {
 $("#popup_centering").slideUp(800);
 document.getElementById('popup_centering').innerHTML='';
 };

function popmeup(u,w){
 $("#popup_centering").removeClass('none');
 $("#popup_centering").slideDown(800);

var close = '<img src="http://www.yasmara.org/zoom/close.png" style="border:none; cursor:pointer;" onclick="closeme()" title="Close" />';
var showme = '<img src="'+u+'" width="'+w+'" align="top" />';

document.getElementById('popup_centering').innerHTML=showme+close;
};