function showWindow(elenment,windowTitle,renderToElement){
  var link = $(elenment).attr('href');
  var renderToE = renderToElement || Ext.getBody();
  var window = new Ext.Window({
    renderTo : renderToE,
    header: false,
    autoLoad: {
        url: link,
        method: 'get',
        callback:function(el,s){
          if(!s){
            alert('load error.');
          }
        },
        timeout: 5
    },
    //y: 100,
    width:400,
    frame:true,
    modal: true
  });
  window.show();
}