function swapIt (img1, img2) {
	document.images[img1].src = img2;
}

 var img_flag=new Array(true, true, true, true);
 
 function ResetFlags(id1, src1, id2, src2, id3, src3)
 {
    for (var i=0; i<img_flag.length; i++)
 	  img_flag[i] = true;
	  
	  if(document.images)
	  	{
		document.images[id1].src= src1;
		document.images[id2].src= src2;
		document.images[id3].src= src3;
		}
 }
   
  function swapItFlagCheck(img1, img2, flag_name)
 {
    if (document.images)
    {
 	  if  (img_flag[flag_name]) 
 		 document.images[img1].src=img2;
    }
  }
  

  function switchClass(id)
         {
         var checkLink = document.getElementById(id);
                 // if nothing is selected...
                 if (this.selectedIndex < 0)
                 {
                         checkLink.className = "topnav"
                 } else {
                         checkLink.className = "topnav_on"
                 }
         }


				home_off = new Image();
				home_on = new Image();
				home_off.src = "images/home_white.jpg"
				home_on.src = "images/home_black.jpg"
				home_off = "images/home_white.jpg"
				home_on = "images/home_black.jpg"
				
				portfolio_off = new Image();
				portfolio_on = new Image();
				portfolio_off.src = "images/portfolio_white.jpg"
				portfolio_on.src = "images/portfolio_black.jpg"
				portfolio_off = "images/portfolio_white.jpg"
				portfolio_on = "images/portfolio_black.jpg"
				
				exchange_off = new Image();
				exchange_on = new Image();
				exchange_off.src = "images/exchange_white.jpg"
				exchange_on.src = "images/exchange_black.jpg"
				exchange_off = "images/exchange_white.jpg"
				exchange_on = "images/exchange_black.jpg"
				
				
				news_off = new Image();
				news_on = new Image();
				news_off.src = "images/news_white.jpg"
				news_on.src = "images/news_black.jpg"
				news_off = "images/news_white.jpg"
				news_on = "images/news_black.jpg"