function doSubmit(form)
{
	var i = 0;
	if(isEmpty(form.username.value) && isEmpty(form.password.value))
	{
		alert("Please enter the username and password.");
		form.username.focus();
		return(false);
	}
	if(isEmpty(form.username.value))
	{
		alert("Please enter the username.");
		form.username.focus();
		return(false);
	}
	if(isEmpty(form.password.value))
	{
		alert("Please enter the password.");
		form.password.focus();
		return(false);
	}

	var objRegExp = /'/;
	if (objRegExp.test(form.username.value) ) 
	{
		alert("Please enter valid user name.");
		return false;
	}

	return (true);
}

	function isEmpty(word) 
	{
		var n = word.length;
		var i;
		for (i=0; i<n; i++) {
		if (word.charAt(i) != ' ') 
		{
			return false;
		}
	}
	return (true);
}

function callDoSubmit () 
{
	if(doSubmit(document.forms[0])) 
	{
		document.forms[0].submit();
	}
}