function LTrim(str)
{
        var whitespace = new String(" \t\n\r ");
        // last space character is not a space, but alt+0160,
        // another invisible char.
        var s = new String(str);
        if (whitespace.indexOf(s.charAt(0)) != -1) {
            // We have a string with leading blank(s)...
            var j=0, i = s.length;
            // Iterate from the far left of string until we
            // don't have any more whitespace...
            while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
                j++;
            // Get the substring from the first non-whitespace
            // character to the end of the string...
            s = s.substring(j, i);
        }
        return s;
}
// Trims all spaces to the right of a specific string
function RTrim(str)
{
        // We don't want to trip JUST spaces, but also tabs,
        // line feeds, etc.  Add anything else you want to
        // "trim" here in whitespace
        var whitespace = new String(" \t\n\r ");
        // last space character is not a space, but alt+0160,
        // another invisible char.
        var s = new String(str);
        if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {
            // We have a string with trailing blank(s)...
            var i = s.length - 1;       // Get length of string
            // Iterate from the far right of string until we
            // don't have any more whitespace...
            while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
                i--;
            // Get the substring from the front of the string to
            // where the last non-whitespace character is...
            s = s.substring(0, i+1);
        }
        return s;
}
                                                                                                                        
// Trims all spaces to the left and right of a specific string by calling RTim
// and LTrim
function Trim(str)
{
        return RTrim(LTrim(str));
}

function IsDate(txtDate)
{
    try
    {
        if (txtDate.length != 10)
        {
            return null;
        }
        else if ( isNaN(txtDate.substring(0, 2))||txtDate.substring(2, 3) != "/" || isNaN(txtDate.substring(3, 5))|| txtDate.substring(5, 6) != "/" || isNaN(txtDate.substring(6, 15)) )
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    catch (e)
    {
        return null;
    }
}



function CheckFields()
	{
		var errmsg="";
		var c1=document.registrazione.testo.value;


		if (Trim(c1) == '')	errmsg = errmsg + "Inserisci un commento:\n";
			

		if (errmsg != '')
		{
			alert(errmsg);
		} else {
			//document.registrazione.submit();
			ajaxFunction();
		}		
}