// JavaScript file for the NHCTC Biotechnology site
// Author: Jim Esberg
// Created: November 15, 2006
// Revised: April 30, 2008

// preloaded images
    var playover = new Image;
    playover.src = "graphics/playG.gif";
    var playoff = new Image;
    playoff.src = "graphics/playY.gif";
	var random1 = new Image;
	random1.src = "images/random1.jpg";
	var random2 = new Image;
	random2.src = "images/random2.jpg";
	var random3 = new Image;
	random3.src = "images/random3.jpg";		
	var random4 = new Image;
	random4.src = "images/random4.jpg";	
	
//mouse over function 
   function mouseoverroutine(buttonName) {

      if (buttonName == "play1") {
      document.getElementById('play1').src = playover.src;
      }
      if (buttonName == "play2") {
      document.getElementById('play2').src = playover.src;
      }
      if (buttonName == "play3") {
      document.getElementById('play3').src = playover.src;
      }
      if (buttonName == "play4") {
      document.getElementById('play4').src = playover.src;
      }	  	  
   }


//mouse off function
   function mouseoutroutine(buttonName) {

      if (buttonName == "play1") {
      document.getElementById('play1').src = playoff.src;
      }
      if (buttonName == "play2") {
      document.getElementById('play2').src = playoff.src;
      }
      if (buttonName == "play3") {
      document.getElementById('play3').src = playoff.src;
      }	 
      if (buttonName == "play4") {
      document.getElementById('play4').src = playoff.src;
      }	   
   }

   
//random image code
//   iContent = new Array("images/indexContent.jpg","images/indexContent2.jpg","images/indexContent3.jpg")
//   iContent = new Array("images/random1.jpg","images/random2.jpg","images/random3.jpg","images/random4.jpg")   
   iContent = new Array(random1.src,random2.src,random3.src,random4.src)      
   iContentCount = iContent.length
   
   function randomIndexContent() {
       if (document.images) {
	      randomNum = Math.floor ((Math.random() * iContentCount))
		  document.randomContent.src = iContent[randomNum]
	   }
   }