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


function fp_show(tab,cls) 
{
	i=1;
	
	while (document.getElementById("tab_"+i))
	 {
	 document.getElementById("tab_"+i).style.display='none';
	 document.getElementById("a"+i).className='';
	 i++;
	 
	 }
	 document.getElementById(tab).style.display='block';
	 document.getElementById(cls).className='sel';
}




function change(show,cls) 
{
	i=1;
	
	while (document.getElementById("t"+i))
	 {
	 document.getElementById("t"+i).style.display='none';
	 document.getElementById("z"+i).className='';
	 i++;	 
	 }
	 document.getElementById(show).style.display='block';
	 document.getElementById(cls).className='sel';
}




function show_err(tab)
{
	document.getElementById(tab).style.display='block';
}

function hide_err(tab)
{
	document.getElementById(tab).style.display='none';
}