function swap_image(show_image, hide_image)
{
document.getElementById(show_image).style.visibility ="visible";
document.getElementById(hide_image).style.visibility ="hidden";
}

function imageover(imageout, imageover, texteid, tcolor)
{
document.getElementById(imageover).style.visibility ="visible";
document.getElementById(imageout).style.visibility ="hidden";
if(texteid!=null && tcolor!=null)
document.getElementById(texteid).style.color=tcolor;
}

function imageout(imageout, imageover, texteid, tcolor)
{
document.getElementById(imageout).style.visibility ="visible";
document.getElementById(imageover).style.visibility ="hidden";
if(texteid!=null && tcolor!=null)
document.getElementById(texteid).style.color=tcolor;
}