function emptyField(textObj)
{
	if(textObj.value.length == 0) return true;

	for(var i=0; i<textObj.value.length;i++) {
		ch = textObj.value.charAt(i);
		if(ch != ' ' && ch != '\t') return false;
	}
	return true;
}

function checkemail(emailObj) {
	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
	if (filter.test(emailObj.value)) {
		return true;
	}
	else{
		return false;
	}
}

function passwordCheck(passwordObj) {
	if (passwordObj.value.length < 5 || passwordObj.value.length > 12) {
		alert("Your password must be greater then 5 and less then 12 characters long");
		return false;
	}
	return true;
}
function textLimit(field, maxlen) {
	if (field.value.length > maxlen + 1) {
		alert('Sorry, maximum 4096 characters allowed!');
	}
	if (field.value.length > maxlen) {
		field.value = field.value.substring(0, maxlen);
	}
}
function IsN(St) { 
	return !/\D/.test(St); 
}