function getcounter(){
     var url = 'counter.php';
     var pars = 'counter=get';
     
     var myAjax = new Ajax.Request( url, {method: 'post', parameters: pars, onSuccess: printCounter});
}

function getEl(el)
{
	if ( document.getElementById )
	{
		return( document.getElementById(el) );
	}
	else if (document.all)
	{
		return( document.all[el] );
	}
	
}


function printCounter(response)
{ 
 var target = 'counter';

  getEl(target).innerHTML= response.responseText;

}