function WebForm_FireDefaultButton(event, target) 
{
    //event.srcElement doesn't work in FF so we check whether
    //it or event.target exists, using whichever is returned
    var element = event.target || event.srcElement;
    
    if (event.keyCode == 13 && !(element && element.tagName.toLowerCase() == "textarea"))
    {
        var defaultButton;
        if (__nonMSDOMBrowser)
        {
            defaultButton = document.getElementById(target);
        }
        else
        {
            defaultButton = document.all[target];
        }
        if (defaultButton && typeof defaultButton.click != "undefined")
        {
            defaultButton.click();
            event.cancelBubble = true;
            if (event.stopPropagation)
            {
                event.stopPropagation();
            }            
            return false;        
         }    
     }
     return true;
}