function showPart(source)
 {
     if( source.id )
         var id = source.id;
     else
         var id = source;
     

     for(var i=0; i<=6; i++){
         hideLogo('part-' + i);
         hideBike('part-' + i);
         var o = document.getElementById('part-' + i)
         if(o) o.className="";
     }
         
     if(source.id) source.className="active";
     showLogo(id);
     showBike(id);
 }
 
 function getLogo(id)
 {
     return document.getElementById(id + '-text');
 }
 
 function getBike(id)
 {
     return document.getElementById(id + '-bike');
 }
 
 function showLogo(id)
 {
     var logo = getLogo(id);
     if(logo)
         logo.style.display="block";
 }
 
 function showBike(id)
 {
     var bike = getBike(id);
     if(bike)
         bike.style.display="block";
 }
 
 function hideLogo(id)
 {
     var logo = getLogo(id);
     if(logo)
         logo.style.display="none";
 } 

 function hideBike(id)
 {
     var bike = getBike(id);
     if(bike)
         bike.style.display="none";     
 }