function swapimg(elImg){

	var obj = document.getElementById(elImg);

	if(obj.src.indexOf("_off")>-1){

		obj.src=obj.src.replace("_off","_over");

	}else{

		obj.src=obj.src.replace("_over","_off");
	}
}

activateMenu = function(nav) {

/* currentStyle restricts the Javascript to IE only */
	if (document.all &&
 document.getElementById(nav).currentStyle) {  
        var navroot = document.getElementById(nav);
        
        /* Get all the list items within the menu */

        var lis=navroot.getElementsByTagName("LI");  
        
		for (i=0; i<lis.length; i++) {				
					
           /* If the LI has another menu level */
            if(lis[i].lastChild.tagName=="UL"){
				
				/* assign the function to the LI */
             	lis[i].onmouseover=function() {											
				   this.id += "_on";
					/* display the inner menu */
                   this.lastChild.style.display="block";
                }
                lis[i].onmouseout=function() {  
					this.id = this.id.replace('_on','');
   					this.lastChild.style.display="none";
                }
            }else {
				lis[i].onmouseover=function() {											
				   this.id += "_on";
				}
                lis[i].onmouseout=function() {  
					this.id = this.id.replace('_on','');
   				}

			}
        }
    }
}


    /* pass the function the id of the top level UL */

    /* remove one, when only using one menu */
  //  activateMenu('nav'); 
    activateMenu('vertnav');