function show(obj){
x=document.getElementById(obj).style;
x.display='block';
}
   function hide(obj){
x=document.getElementById(obj).style;
x.display='none';
}
 
 
     function testcheckbox(sel,chbox){
 document.getElementById(sel).disabled = !(document.getElementById(chbox).checked)   	

}

function showHide(obj){
x=document.getElementById(obj).style;
x.display=(x.display == 'block')?'none':'block';
}