function clearField(theText) {
 theText.value="";
}
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() {	
                   /* display the inner menu */
                   this.lastChild.style.display="block";
//                   if (this.id=="tn3") this.style.background-color="black";
                }
                lis[i].onmouseout=function() {                       
                   this.lastChild.style.display="none";
                }
            }
          //  if(lis[i].id=="tn3") {
            //	lis[i].onmouseover=function() { this.className+=" sfhover"; } 
		//	lis[i].onmouseout=function() { this.className=this.className.replace(new RegExp(" sfhover\\b"), ""); } 
	//	}
        }
    }
}

window.onload= function(){
    activateMenu('nav');
}