// test the browser for ie or nets version 3 or greater
if ((navigator.appVersion.substring(0,1) >= 3) && 
    (navigator.appName == ("Netscape") || 
    (navigator.appName == "Microsoft Internet Explorer"))) {
    // build the array for on images (when mouseover) and off
     offImages = new Array();
     onImages = new Array();
     selImages = new Array();
     for (var i = 0; i<= 4; i++) {
          offImages[i] = new Image();
          offImages[i].src = "images/Nav/n" + i + "d.gif";
          onImages[i] = new Image();
          onImages[i].src = "images/Nav/n" + i + "s.gif";
          selImages[i] = new Image();
          selImages[i].src = "images/Nav/n" + i + ".gif";
     }
}

// swap to the on images when mouseover
function select(i) {
   if (document.images) {
      var itemname = "n" + i;
      document.images[itemname].src = onImages[i].src;
  }
}

// swap to the off images when mouseout
function deselect(i) {
   if (document.images) {
      var itemname = "n" + i;
      document.images[itemname].src = offImages[i].src;
   }
}

// swap to the selected images when mouseout
function selected(i) {
   if (document.images) {
      var itemname = "n" + i;
      document.images[itemname].src = selImages[i].src;
   }
}

// sub nav open
function nav(i) {
	navOff();
	var nav = document.getElementById("nav" + i);
	nav.style.display = "block";
}

// sub nav close
function navOff() {
     for (var i = 0; i<= 4; i++) {
	 	document.getElementById("nav" + i).style.display = "none";
     }
}


function menuOn() {
    // These values get set in the script behind.  
    // So we can force the right menu item to be "ON"
    var mNum;
    var mName = new Array("doctors","resources","patients" ,"research", "about");
    var mTD = document.getElementById(m);
    var msub = document.getElementById(sm);

    // Turn everything ON if the value and ID exsists
    if (m != null && sm != null) {
        // Main Menu
        if (mTD) {
            for (var ii = 0; ii<= 4; ii++) {
                if (m == mName[ii]) {mNum = ii;}
            }        
            mTD.innerHTML = "<a href='#' onMouseOver='nav(" + mNum + ");select(" + mNum + ");return true' onMouseOut='select(" + mNum + ");return true'><img src='images/Nav/n" + mNum + "s.gif' border='0' id='n" + mNum + "' /></a>";
        }

        // Sub Menu
	    if (msub) {msub.className = "menuSidebarON";}
    }
}