function MM_preloadImages() 
{
    var d=document; 
    if( d.images )
    { 
        if(!d.MM_p) 
            d.MM_p = new Array();

        var j=d.MM_p.length, a=arguments; 
        for( var i=0; i<a.length; i++ )
        { 
            d.MM_p[j]       = new Image();
            d.MM_p[j++].src = a[i];
        }
    }
}

function MM_restoreById(id) 
{
    var img_el = document.getElementById(id);
    MM_restore(img_el);
}
function MM_restore( img_el )
{
    if( img_el && img_el.orig_src )
        img_el.src = img_el.orig_src;
}

function MM_hoverById( id, src ) 
{ 
    var img_el = document.getElementById(id);
    MM_hover( img_el, src );
}
function MM_hover( img_el, src ) 
{ 
    if( img_el )
    {
        if( ! img_el.orig_src )
            img_el.orig_src = img_el.src;
        img_el.src = src;
    }
}