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)
{
imgs1on=new Image(); imgs1on.src="../img/snav_svc_over.gif";
imgs1off=new Image(); imgs1off.src="../img/snav_svc_off.gif";

imgs2on=new Image(); imgs2on.src="../img/snav_svc_mt_over.gif";
imgs2off=new Image(); imgs2off.src="../img/snav_svc_mt_off.gif";

imgs3on=new Image(); imgs3on.src="../img/snav_svc_ps_over.gif";
imgs3off=new Image(); imgs3off.src="../img/snav_svc_ps_off.gif";

imgs4on=new Image(); imgs4on.src="../img/snav_svc_pm_over.gif";
imgs4off=new Image(); imgs4off.src="../img/snav_svc_pm_off.gif";


}