window.onload = function()
{
	PreloadImages();
}

//+++++++++++++++++++++++++++++
function PreloadImages()
{
	topon = new Image;
	topon.src = "graphics/top_on.gif";
	topoff = new Image;
	topoff.src = "graphics/top_off.gif";
}

//+++++++++++++++++++++++++++++
function img_act(imgName)
{
	eval("document."+imgName+".src="+imgName+"on.src;");
}

//+++++++++++++++++++++++++++++
function img_inact(imgName)
{
	eval("document."+imgName+".src="+imgName+"off.src;");
}