//menu butons
		menu= new Array();
		menu[0]= new Image();
		menu[0].src= "images/home_off.jpg";
		menu[1]= new Image();
		menu[1].src= "images/home_over.jpg";
		menu[2]= new Image();
		menu[2].src= "images/wbv_off.jpg";
		menu[3]= new Image();
		menu[3].src= "images/wbv_over.jpg";
		menu[4]= new Image();
		menu[4].src= "images/information_off.jpg";
		menu[5]= new Image();
		menu[5].src= "images/information_over.jpg";
		menu[6]= new Image();
		menu[6].src= "images/userguide_off.jpg";
		menu[7]= new Image();
		menu[7].src= "images/userguide_over.jpg";
		menu[8]= new Image();
		menu[8].src= "images/purchase_off.jpg";
		menu[9]= new Image();
		menu[9].src= "images/purchase_over.jpg";
		menu[10]= new Image();
		menu[10].src= "images/contact_off.jpg";
		menu[11]= new Image();
		menu[11].src= "images/contact_over.jpg";
		
		function b_on(id) {
			var myImg= document.getElementById('img'+id);
			myImg.src= menu[id*2+1].src;
		}
		function b_off(id) {
			var myImg= document.getElementById('img'+id);
			myImg.src= menu[id*2].src;
		}

//date function
 Day_of_week = new Array("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday");
 Month = new Array("January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
function today_date(){
 	var myDiv= document.getElementById("header_data"); //this will make header_data div an object 
	var today= new Date();
	myDiv.innerHTML= "<span style='position: absolute; bottom: 0px'>"+Day_of_week[today.getDay()]+", "+today.getDate()+" "+Month[today.getMonth()]+" "+today.getFullYear()+"</span>"; //here I put the string to my object
}