function acReset(){
 ac01 = document.getElementById('ac_01_a');
 ac02 = document.getElementById('ac_02_a');
 ac03 = document.getElementById('ac_03_a');
 ac04 = document.getElementById('ac_04_a');

 ac01.style.backgroundPosition = "0px 0px";	
 ac02.style.backgroundPosition = "0px 0px";	
 ac03.style.backgroundPosition = "0px 0px";	
 ac04.style.backgroundPosition = "0px 0px";	
 
}


function acMove(val){
	
  acReset();
  ac = document.getElementById(val)
  ac.style.backgroundPosition = "0px -24px";	
  
}

function clearText(thefield) {
  if (thefield.defaultValue==thefield.value) thefield.value = "";
}