function check_char(the_char)
{
	if (the_char == "1" || the_char == "2" || the_char == "3" || the_char == "4" || the_char == "5" || 
	    the_char == "6" || the_char == "7" || the_char == "8" || the_char == "9" || the_char == "0" ||
	    the_char == "." || the_char == "," )
	    return true;
	else
	    return false;
}

function check_str(input) 
{
  var ok = true;

	for (var i = 0; i < input.length; i++) 
	{
    	var chr = input.charAt(i);
    	if(!check_char(chr))
    	{
    	    ok = false;
    	    break;
    	}	    
	}
 
  	return ok;
}


function lire_to_euro()
{
    var text_lire = document.form_euro.text_lire.value;
	
	if(text_lire != "" && check_str(text_lire))
	{
	    document.form_euro.text_euro.value = Math.round(text_lire/1936.27*100)/100;
	}
}

function euro_to_lire()
{
    var text_euro = document.form_euro.text_euro.value;
	
	if(text_euro != "" && check_str(text_euro))
	{
	    document.form_euro.text_lire.value = Math.round(text_euro*1936.27);
	}
}