function bla(id){
if(pid!=1)document.getElementById('bla1').style.backgroundImage="url(trans.gif)";
if(pid!=2)document.getElementById('bla2').style.backgroundImage="url(trans.gif)";
if(pid!=3)document.getElementById('bla3').style.backgroundImage="url(trans.gif)";
if(pid!=4)document.getElementById('bla4').style.backgroundImage="url(trans.gif)";
if(pid!=5)document.getElementById('bla5').style.backgroundImage="url(trans.gif)";
if(pid!=6)document.getElementById('bla6').style.backgroundImage="url(trans.gif)";
if(id>0){document.getElementById('bla'+id).style.backgroundImage="url(b"+id+".png)";}
}