if (document.images)
{
  pic1= new Image(70,25); 
  pic1.src="images/home_hover.gif"; 

  pic2= new Image(78,25); 
  pic2.src="images/aboutUs_hover.gif";

  pic3= new Image(129,25); 
  pic3.src="images/waterTreatment_hover.gif";

  pic4= new Image(112,25); 
  pic4.src="images/airPurification_hover.gif";

  pic5= new Image(76,25); 
  pic5.src="images/research_hover.gif";

  pic6= new Image(90,25); 
  pic6.src="images/contactUs_hover.gif";

  pic7= new Image(70,25); 
  pic7.src="images/home_current.gif"; 

  pic8= new Image(78,25); 
  pic8.src="images/aboutUs_current.gif";

  pic9= new Image(129,25); 
  pic9.src="images/waterTreatment_current.gif";

  pic10= new Image(112,25); 
  pic10.src="images/airPurification_current.gif";

  pic11= new Image(76,25); 
  pic11.src="images/research_current.gif";

  pic12= new Image(90,25); 
  pic12.src="images/contactUs_current.gif";


}



function prepareHover(link)
{
  var linkClass = link.className;
  
  if (linkClass.indexOf('current') == -1)
  {
    link.onmouseover = function() {
      this.className = linkClass+'_hover';

    }
    
    link.onmouseout = function() {
      this.className = linkClass;
    }
  }
}

function prepareMenu()
{
  if (!document.getElementById) return false;
  if (!document.getElementsByTagName) return false;
  if (!document.getElementById('navMenu')) return false;

  var navMenu = document.getElementById('navMenu');
  var links = navMenu.getElementsByTagName('a');
  
  for (var i=0; i<links.length; i++)
  {
  
    var linkurl = links[i].getAttribute('href');
    var currenturl = window.location.href;
    var linkClass = links[i].className;
    
    
    if ((currenturl.indexOf(linkurl) != -1 ) || ((links[i].className == "index") && (currenturl.indexOf(".php") == -1 )))
    {  
      links[i].className = linkClass+'_current';
    }
    
    prepareHover(links[i]);
    
  
  }

}

addLoadEvent(prepareMenu);