function newImage(arg) {

	if (document.images) {

		rslt = new Image();

		rslt.src = arg;

		return rslt;

	}

}



function changeImages() {

	if (document.images && (preloadFlag == true)) {

		for (var i=0; i<changeImages.arguments.length; i+=2) {

			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];

		}

	}

}



var preloadFlag = false;



function preloadImages() {

	if (document.images) {

		home = newImage("images/nav_home_on.gif");

		why = newImage("images/nav_why_on.gif");

		tasks = newImage("images/nav_tasks_on.gif");

		hardware = newImage("images/nav_hardware_on.gif");

		support = newImage("images/nav_support_on.gif");

		price = newImage("images/nav_price_on.gif");

		contact = newImage("images/nav_contact_on.gif");

		preloadFlag = true;

	}

}



//preload images 



img1=new Image()

img1.src="images/nav_home.gif"

img2=new Image()

img2.src="images/nav_why.gif"

img3=new Image()

img3.src="images/nav_tasks.gif"

img4=new Image()

img4.src="images/nav_hardware.gif"

img5=new Image()

img5.src="images/nav_support.gif"

img6=new Image()

img6.src="images/nav_price.gif"

img7=new Image()

img7.src="images/nav_contact.gif"