function precache(img_name)
{
    img_on = new Image();
    img_on.src = "render/"+img_name;
}

function colorize_image(img_name)
{
    document.getElementById(img_name).src = "render/"+img_name+"c.gif";
}


function uncolorize_image(img_name)
{
    document.getElementById(img_name).src = "render/"+img_name+"s.gif";
}

function colorize_foto(img_name)
{
    document.getElementById(img_name).src = "render/"+img_name+"minc.jpg";
}


function uncolorize_foto(img_name)
{
    document.getElementById(img_name).src = "render/"+img_name+"min.jpg";
}

function colorize_yh(img_name)
{
    document.getElementById(img_name).src = "img/img_twojdom2.gif";
}


function uncolorize_yh(img_name)
{
    document.getElementById(img_name).src = "img/img_twojdom.gif";
}

function precache_yh()
{
    img_on = new Image();
    img_on.src = "img/img_twojdom2.gif";
}