newimage	=	new Image ();
newimage.src = './images/contact_over.jpg';
newimage1	=	new Image ();
newimage1.src = './images/service_over.jpg';
newimage2	=	new Image ();
newimage2.src = './images/client_over.jpg';   
function toggle_highlight_nav(element, image_name){ 
	element.style.background = 'url(./images/'+image_name+')';
}

function toggle_service_tab (element, tab_name){
	if ('marketing_tab' == tab_name){
		document.getElementById('service_type_tab').className = 'marketing_service_i_bottom_container'; 
	}else if ('creative_tab' == tab_name){
		document.getElementById('service_type_tab').className = 'creative_service_i_bottom_container'; 
	}else{
		document.getElementById('service_type_tab').className = 'service_i_bottom_container'; 
	}
	return false;
}