function imgovernav(imgname){

if(imgovernav.arguments.length == 2)
{
	imgovernav.arguments[0].src = imgover.arguments[1];
}
else
{
	imgovernav.arguments[0].src = "images/nav/square_down.gif";
}
}
function imgoutnav(imgname){
imgname.src="images/nav/square_up.gif" }




function newNav(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
function changeNav() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeNav.arguments.length; i+=2) {
			document[changeNav.arguments[i]].src = changeNav.arguments[i+1];
		}
	}
}
var preloadFlag = false;
function preloadNav() {
	if (document.images) {
		home_over = newNav("images/nav/home2.gif");
		software_over = newNav("images/nav/software2.gif");
		services_over = newNav("images/nav/services2.gif");
		datacenter_over = newNav("images/nav/datacenter2.gif");
		casestudies_over = newNav("images/nav/casestudies2.gif");
		about_over = newNav("images/nav/about2.gif");
		contact_over = newNav("images/nav/contact2.gif");
		preloadFlag = true;
	}
}