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if(document.images){

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      holit.src = "../images/nav/nav01_home-on.gif"; 
      hodim = new Image(); 
      hodim.src = "../images/nav/nav01_home.gif";
      exlit = new Image(); 
      exlit.src = "../images/nav/nav02_expertise-on.gif"; 
      exdim = new Image(); 
      exdim.src = "../images/nav/nav02_expertise.gif"; 
      prlit = new Image();
      prlit.src = "../images/nav/nav03_projects-on.gif"; 
      prdim = new Image(); 
      prdim.src = "../images/nav/nav03_projects.gif"; 
      prilit = new Image(); 
      prilit.src = "../images/nav/nav04_principals-on.gif"; 
      pridim = new Image(); 
      pridim.src = "../images/nav/nav04_principals.gif"; 
	  colit = new Image(); 
      colit.src = "../images/nav/nav05_contactus-on.gif"; 
      codim = new Image(); 
      codim.src = "../images/nav/nav05_contactus.gif";
      relit = new Image(); 
      relit.src = "../images/subnav/snav01_residential-on.gif"; 
      redim = new Image(); 
      redim.src = "../images/subnav/snav01_residential.gif"; 
      comlit = new Image(); 
      comlit.src = "../images/subnav/snav02_commercial-on.gif"; 
      comdim = new Image(); 
      comdim.src = "../images/subnav/snav02_commercial.gif";
      sulit = new Image(); 
      sulit.src = "../images/subnav/snav03_surveying-on.gif"; 
      sudim = new Image(); 
      sudim.src = "../images/subnav/snav03_surveying.gif";
      pulit = new Image(); 
      pulit.src = "../images/subnav/snav04_public-on.gif"; 
      pudim = new Image(); 
      pudim.src = "../images/subnav/snav04_public.gif";
} 

function rollOn(n){
if (document.images){
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        document [n].src=light;
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}

function rollOff(n){
if (document.images){
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}

//-->