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)
{
imgg1on=new Image(); imgg1on.src="img/nav_home_over.gif";
imgg1off=new Image(); imgg1off.src="img/nav_home_off.gif";

imgg2on=new Image(); imgg2on.src="img/nav_services_over.gif";
imgg2off=new Image(); imgg2off.src="img/nav_services_off.gif";

imgg3on=new Image(); imgg3on.src="img/nav_clients_over.gif";
imgg3off=new Image(); imgg3off.src="img/nav_clients_off.gif";

imgg4on=new Image(); imgg4on.src="img/nav_casestudies_over.gif";
imgg4off=new Image(); imgg4off.src="img/nav_casestudies_off.gif";

imgg5on=new Image(); imgg5on.src="img/nav_aboutus_over.gif";
imgg5off=new Image(); imgg5off.src="img/nav_aboutus_off.gif";

imgg6on=new Image(); imgg6on.src="img/nav_contactus_over.gif";
imgg6off=new Image(); imgg6off.src="img/nav_contactus_off.gif";

// imgg7on=new Image(); imgg7on.src="img/nav_login_over.gif";
// imgg7off=new Image(); imgg7off.src="img/nav_login_off.gif";

}