function SwitchState(event, name){

	image_elem = document.getElementById("img_"+name);

	if ( image_elem )
	{
		image_elem.src = image_array[name][event].src;
	}
			
}

image_array = new Array();

image_array["about"] = new Array();
image_array["about"]["out"] = new Image();
image_array["about"]["out"].src = "images/about_btn_out.jpg";
image_array["about"]["over"] = new Image();
image_array["about"]["over"].src = "images/about_btn_over.jpg";

image_array["staff"] = new Array();
image_array["staff"]["out"] = new Image();
image_array["staff"]["out"].src = "images/staff_btn_out.jpg";
image_array["staff"]["over"] = new Image();
image_array["staff"]["over"].src = "images/staff_btn_over.jpg";

image_array["contact"] = new Array();
image_array["contact"]["out"] = new Image();
image_array["contact"]["out"].src = "images/contact_btn_out.jpg";
image_array["contact"]["over"] = new Image();
image_array["contact"]["over"].src = "images/contact_btn_over.jpg";

image_array["download"] = new Array();
image_array["download"]["out"] = new Image();
image_array["download"]["out"].src = "images/download_btn_out.jpg";
image_array["download"]["over"] = new Image();
image_array["download"]["over"].src = "images/download_btn_over.jpg";