if (document.images) {
	nav_image_1= new Image(); nav_image_1.src="images/nav/home.gif";
	nav_image_1_on= new Image(); nav_image_1_on.src="images/nav/home_over.gif";
	nav_image_2= new Image(); nav_image_2.src="images/nav/corporate.gif";
	nav_image_2_on= new Image(); nav_image_2_on.src="images/nav/corporate_over.gif";
	nav_image_3= new Image(); nav_image_3.src="images/nav/history.gif";
	nav_image_3_on= new Image(); nav_image_3_on.src="images/nav/history_over.gif";
	nav_image_4= new Image(); nav_image_4.src="images/nav/service.gif";
	nav_image_4_on= new Image(); nav_image_4_on.src="images/nav/service_over.gif";
	nav_image_5= new Image(); nav_image_5.src="images/nav/company_assets.gif";
	nav_image_5_on= new Image(); nav_image_5_on.src="images/nav/company_assets_over.gif";
	nav_image_6= new Image(); nav_image_6.src="images/nav/recruitment.gif";
	nav_image_6_on= new Image(); nav_image_6_on.src="images/nav/recruitment_over.gif";
	nav_image_7= new Image(); nav_image_7.src="images/nav/press_office.gif";
	nav_image_7_on= new Image(); nav_image_7_on.src="images/nav/press_office_over.gif";
	nav_image_8= new Image(); nav_image_8.src="images/nav/contact.gif";
	nav_image_8_on= new Image(); nav_image_8_on.src="images/nav/contact_over.gif";
	nav_image_9= new Image(); nav_image_9.src="images/nav/environment.gif";
	nav_image_9_on= new Image(); nav_image_9_on.src="images/nav/environment_over.gif";
}
function imgover(imgName) {
	if (document.images) {
		imgOn=eval(imgName + "_on.src");
		document[imgName].src= imgOn;
	}
}
function imgoff(imgName) {
	if (document.images) {
		imgOff=eval(imgName + ".src");
		document[imgName].src= imgOff;
	}
}