ModalPopupExtender have problem with browsers

Question

I had ModalPopupExtender where display when user unregisterd so it worked well with IE browser but with safari and firefox it displayed well but when I click on button it didnot give ne any event you can access this through this link (http://beta.elarabygroup.com/DealerList.aspx) with user:saad password:111 .please any one help me.

.modalBackground { background-color: #F5F5DC; filter:alpha(opacity=70); opacity:0.7;

}

.modalPopup { background-color: #F5F5DC; border-width:3px; border-style:solid; border-color:Gray; padding:5px; width: 350px; height:300px; }

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