var base = "images/";
	
	function preload() {
		var the_images = new Array('drop_about_bg.gif','drop_media_bg.gif','drop_services_bg.gif','drop_political_bg.gif','drop_clients_bg.gif');
		preload_images(the_images);
	}
	
	function preload_images(the_images_array) {
		for(loop = 0; loop < the_images_array.length; loop++)  { var an_image = new Image(); an_image.src = base + the_images_array[loop]; } 
	}

	function turnOffAllLayers()
	{
		document.getElementById('drop_about').style.display="none";
		document.getElementById('drop_media').style.display="none";
		document.getElementById('drop_services').style.display="none";
		document.getElementById('drop_political').style.display="none";
		document.getElementById('drop_clients').style.display="none";
	}
		
	function topNavDropDown(dropDownDivName)
	{
		turnOffAllLayers();
		dropDownDiv=document.getElementById(dropDownDivName);
		if (dropDownDiv.style.display=="none")  dropDownDiv.style.display="block";
		else dropDownDiv.style.display="none";
	}