function imgOn(imgName)
{if (document.images) {document[imgName].src=eval(imgName+"on.src");}}

function imgOff(imgName)
{if (document.images) {document[imgName].src=eval(imgName+"off.src");}}

if (document.images)
{
imga1on=new Image(); imga1on.src="../img/snav_aboutus_over.gif";
imga1off=new Image(); imga1off.src="../img/snav_aboutus_off.gif";

imga2on=new Image(); imga2on.src="../img/snav_aboutus_approach_over.gif";
imga2off=new Image(); imga2off.src="../img/snav_aboutus_approach_off.gif";

}