function newImage(arg) {
if (document.images) {
	rslt = new Image();
	rslt.src = arg;
	return rslt;}}

function changeImagesArray(array) {
    if (preloadFlag == true) {
	    var d = document; var img; var i;
	    for (i=0;i<array.length;i+=2) {
		    img = null; var n = array[i];
		    if (d.images) {
			    if (d.layers) {img = findElement(n,0);}
			    else {img = d.images[n];}
		    }
		    if (!img && d.getElementById) {img = d.getElementById(n);}
		    if (!img && d.getElementsByName) {
			    var elms = d.getElementsByName(n);
			    if (elms) {
				    for (j=0;j<elms.length;j++) {
					    if (elms[j].src) {img = elms[j]; break;}
				    }}}
		    if (img) {img.src = array[i+1];}
	    }}}

function changeImages() {changeImagesArray(changeImages.arguments);}			

var preloadFlag = false;
function preloadImages() {
    if (document.images) {
	    pre_nav_home_over = newImage('http://www.medpages.co.za/mphtml/v2/images/nav_home_over.png');
	    pre_nav_search_over = newImage('http://www.medpages.co.za/mphtml/v2/images/nav_search_over.png');
	    pre_nav_getlisted_over = newImage('http://www.medpages.co.za/mphtml/v2/images/nav_getlisted_over.png');
	    pre_nav_products_over = newImage('http://www.medpages.co.za/mphtml/v2/images/nav_products_over.png');
	    pre_nav_about_over = newImage('http://www.medpages.co.za/mphtml/v2/images/nav_about_over.png');
	    pre_nav_contact_over = newImage('http://www.medpages.co.za/mphtml/v2/images/nav_contact_over.png');
	    preloadFlag = true;
    }}