function resetBar(myTab, myRow, maxId) {
// window.alert(myRow.nodeType);

 for (var Id = 1; Id <= maxId; Id++) {
   var myNode = myRow.getElementsByTagName("td")[Id];
     var node_bg_color = top.header.document.createAttribute("bgcolor");
       node_bg_color.nodeValue = "";
       myNode.setAttributeNode(node_bg_color);

   var myAncor=myNode.getElementsByTagName("a")[0];
     var node_class = top.header.document.createAttribute("class");
       node_class.nodeValue = "white";
       myAncor.setAttributeNode(node_class);
       // window.alert(myAncor.nodeType);
 }
}

function setButton(Id, maxId) {
var myTab = top.header.document.getElementById("topnav");
var myRow = myTab.getElementsByTagName("tr")[0];

resetBar(myTab, myRow, maxId);
if (Id == 0) return 0;

var myNode=myRow.getElementsByTagName("td")[Id];
var myAncor=myNode.getElementsByTagName("a")[0];

var node_bg_color = top.header.document.createAttribute("bgcolor");
 node_bg_color.nodeValue = "#000099";
 myNode.setAttributeNode(node_bg_color);

var node_class = top.header.document.createAttribute("class");
 node_class.nodeValue = "yellow";
 myAncor.setAttributeNode(node_class);
 
return 0;
}