/** Function for trim value */
String.prototype.trim = function() {
return this.replace(/^\s+|\s+$/g,"");
}

/** Function for text limit */
function limitText(limitField, limitNum) {
    if (limitField.value.length > limitNum) {
        limitField.value = limitField.value.substring(0, limitNum);
	alert('You can enter only 500 characters.');
    } 
}