function SwitchMenu(obj){
  if(document.getElementById)
  {
	var el = document.getElementById(obj);
	var ar = document.getElementById("masterdiv").getElementsByTagName("span"); 
	
	if(el.style.display != "block")
	{ 
		var t;
		
		for (var i=0; i<ar.length; i++)
		{
			if (ar[i].className=="catalog_sub")
			{
				t = 1;
				for (j=0 ; j<objArr.length ; j++)
					if (ar[i].id == obj[j])
					{
						t = 0;
						break;
					}
				if ((t == 1) && (ar[i].style.display == "block"))
				{
					ar[i].style.display = "none";
					document.getElementById("img_"+ar[i].id).src="images/m-p.gif";
				}
			}
		}
		el.style.display = "block";
		document.getElementById("img_"+el.id).src="images/m-m.gif";
	}
	else	// el.style.display == "block"
	{
		el.style.display = "none";
		document.getElementById("img_"+el.id).src="images/m-p.gif";
	}
  }
}