if (document.images) {
   
     button1 = new Image
     button2 = new Image
	 
	 button3 = new Image
     button4 = new Image
	 
	 button5 = new Image
     button6 = new Image
	 
	 
	 	 
     button1.src = 'images/products.jpg'
     button2.src = 'images/products-hvr.jpg'
	 
	 button3.src = 'images/know.jpg'
     button4.src = 'images/know-hvr.jpg'
	 
	 button5.src = 'images/know2.jpg'
     button6.src = 'images/know2-hvr.jpg'
 }


function expand(s)
{
  var td = s;
  var d = td.getElementsByTagName("div").item(0);

  td.className = "menuHover";
  d.className = "menuHover";
}

function collapse(s)
{
  var td = s;
  var d = td.getElementsByTagName("div").item(0);

  td.className = "menuNormal";
  d.className = "menuNormal";
}