function changeimage(_DestID,_caption){
        document.getElementById("ScreenCaption").innerHTML = _caption; 
        document.getElementById("ScreenPic").src = _DestID;
        
}

function changemultipleimage(_WhichScreen,_WhichLegend,_DestID,_caption){
        document.getElementById(_WhichLegend).innerHTML = _caption; 
        document.getElementById(_WhichScreen).src = _DestID;
        
}