function CapturarEnter(btnClientId,btnUniqueId,event)
{
    if (document.all)
    {
        if (event.keyCode==13)
        {
            event.returnValue=false;
            event.cancel=true;
            document.getElementById(btnClientId).click();
       
        }
    }
    else if (document.getElementById)
    {
        if (event.which==13)
        {
            event.returnValue=false;
            event.cancel=true;
            __doPostBack(btnUniqueId,'')
        }
    }
}