if (document.images) {
  image1on = new Image();
  image1on.src = "graphics/navigation/home_button_1.gif";

  image2on = new Image();
  image2on.src = "graphics/navigation/history_button_1.gif";

  image3on = new Image();
  image3on.src = "graphics/navigation/inventory_button_1.gif";
  
  image4on = new Image();
  image4on.src = "graphics/navigation/contact_button_1.gif";
  
  image5on = new Image();
  image5on.src = "graphics/navigation/search_button_1.gif";    

  image6on = new Image();
  image6on.src = "graphics/navigation/inv_csp_button_1.gif"; 
  
  image7on = new Image();
  image7on.src = "graphics/navigation/inv_cse_button_1.gif"; 
  
  image8on = new Image();
  image8on.src = "graphics/navigation/inv_cnp_button_1.gif"; 
  
  image9on = new Image();
  image9on.src = "graphics/navigation/inv_pao_button_1.gif";       
  
  image10on = new Image();
  image10on.src = "graphics/navigation/inv_ptm_button_1.gif";   
  
  image11on = new Image();
  image11on.src = "graphics/navigation/inv_por_button_1.gif";   
  
  image13on = new Image();
  image13on.src = "graphics/navigation/news_button_1.gif";
  
  image15on = new Image();
  image15on.src = "graphics/navigation/inv_bijar_button_1.gif";
  
  image16on = new Image();
  image16on.src = "graphics/navigation/inv_heriz_button_1.gif"; 
  
  image1off = new Image();
  image1off.src = "graphics/navigation/home_button_0.gif";

  image2off = new Image();
  image2off.src = "graphics/navigation/history_button_0.gif";

  image3off = new Image();
  image3off.src = "graphics/navigation/inventory_button_0.gif";

  image4off = new Image();
  image4off.src = "graphics/navigation/contact_button_0.gif";

  image5off = new Image();
  image5off.src = "graphics/navigation/search_button_0.gif";
  
  image6off = new Image();
  image6off.src = "graphics/navigation/inv_csp_button_0.gif";  
  
  image7off = new Image();
  image7off.src = "graphics/navigation/inv_cse_button_0.gif"; 
  
  image8off = new Image();
  image8off.src = "graphics/navigation/inv_cnp_button_0.gif";     

  image9off = new Image();
  image9off.src = "graphics/navigation/inv_pao_button_0.gif"; 
  
  image10off = new Image();
  image10off.src = "graphics/navigation/inv_ptm_button_0.gif"; 
  
  image11off = new Image();
  image11off.src = "graphics/navigation/inv_por_button_0.gif";     
 
  image13off = new Image();
  image13off.src = "graphics/navigation/news_button_0.gif";  

  image15off = new Image();
  image15off.src = "graphics/navigation/inv_bijar_button_0.gif";
  
  image16off = new Image();
  image16off.src = "graphics/navigation/inv_heriz_button_0.gif"; 
    
}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}

/

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}