function preloadImages() {
if (document.images) {
		tn_news_over = new Image();
		tn_news_over.src="/images/tn_news_over.gif"
		tn_aboutjea_over = new Image();
		tn_aboutjea_over.src="/images/tn_aboutjea_over.gif"
		tn_report_over = new Image();
		tn_report_over.src="/images/tn_report_over.gif"
		tn_paybill_over = new Image();
		tn_paybill_over.src="/images/tn_paybill_over.gif"
		tn_careers_over = new Image();
		tn_careers_over.src="/images/tn_careers_over.gif"
		tn_public_over = new Image();
		tn_public_over.src="/images/tn_public_over.gif"
		tn_contact_over = new Image();
		tn_contact_over.src="/images/tn_contact_over.gif"
		mst_foryourhome_over = new Image();
		mst_foryourhome_over.src="/images/mst_foryourhome_over.gif"
		mst_foryourbus_over = new Image();
		mst_foryourbus_over.src="/images/mst_foryourbus_over.gif"
		mst_inourcomm_over = new Image();
		mst_inourcomm_over.src="/images/mst_inourcomm_over.gif"
	}
}

var pathOfImg = "/images/";
if (document.images)	{ 
	function buttonOn(imgName) {
	    document.images[imgName].src= pathOfImg + imgName + "_over.gif"
	}
	  
	function buttonOff(imgName) {
	    document.images[imgName].src= pathOfImg + imgName + ".gif"
	}
}