var imgobj = document.getElementsByTagName("img");
var imgsel = 'services_1'


function mLarge(id){
               imgobj['img_large'].src = 'pics/services/'+id+'.jpg';
}

function mMoves(aType,aId){
      if(aType=='roll'&&imgsel!=aId){
            mLarge(aId)
            imgsel = aId
      }else if(aType=='load'){
            if(aId==imgsel){
                  mLarge(aId);
                  if(imgobj['img_large'].style.visibility=='' || imgobj['img_large'].style.visibility=='hidden'){
                        imgobj['img_large'].style.visibility = 'visible';
                  }
            }
      }
}