//Switch big image to on-mouse-overed small image
function SwitchImages(ImageToDisplay)
{            
    //Hide all big images if exist
    if (document.getElementById("BigImage1"))
        { document.getElementById("BigImage1").style.display = "none"; }
    if (document.getElementById("BigImage2"))
        { document.getElementById("BigImage2").style.display = "none"; }        
    if (document.getElementById("BigImage3"))
        { document.getElementById("BigImage3").style.display = "none"; }
    if (document.getElementById("BigImage4"))
        { document.getElementById("BigImage4").style.display = "none"; }
    if (document.getElementById("BigImage5"))
        { document.getElementById("BigImage5").style.display = "none"; }
    if (document.getElementById("BigImage6"))
        { document.getElementById("BigImage6").style.display = "none"; }                       
    //display onmouseovered image
    document.getElementById("BigImage" + ImageToDisplay).style.display = "block";    
}