// navroll.js  javascript code

// Handles rollover images for navbar links
// May 5, 2003  by Bruce Harper

var pics = new Array();

var objCount = 0; // number of (changing) images on web-page

function preload(name, first, second) {  

  // preload images and place them in an array

    pics[objCount] = new Array(3);
    pics[objCount][0] = new Image();
    pics[objCount][0].src = first;
    pics[objCount][1] = new Image();
    pics[objCount][1].src = second;
    pics[objCount][2] = name;
    objCount++;
  }

function on(name){
     for (i = 0; i < objCount; i++) {
      if (document.images[pics[i][2]] != null)
        if (name != pics[i][2]) { 
          // set back all other pictures
          document.images[pics[i][2]].src = pics[i][0].src;
        } else {
           // show the second image because cursor moves across this image
           document.images[pics[i][2]].src = pics[i][1].src;
        }
    }
  }

function off(){
     for (i = 0; i < objCount; i++) {
      // set back all pictures
      if (document.images[pics[i][2]] != null) 
        document.images[pics[i][2]].src = pics[i][0].src;
    }
  }

// preload images - you have to specify which images should be preloaded
// and which Image-object on the wep-page they belong to (this is the first
// argument). Change this part if you want to use different images (of course
// you have to change the body part of the document as well)

preload("extcom", "images/navbar/nbaec.gif", "images/navbar/nbaecov.gif");
preload("license", "images/navbar/nblta.gif", "images/navbar/nbltaov.gif");
preload("market", "images/navbar/nbmsc.gif", "images/navbar/nbmscov.gif");
preload("news", "images/navbar/nbni.gif", "images/navbar/nbniov.gif");
preload("pubs", "images/navbar/nbpoc.gif", "images/navbar/nbpocov.gif");
preload("vizcom", "images/navbar/nbvbc.gif", "images/navbar/nbvbcov.gif");
preload("wvtf", "images/navbar/nbwvtf.gif", "images/navbar/nbwvtfov.gif");


// -->