function isDefaultVal(oField, sDefault, sValue)
{
	if (sDefault == sValue)
	{
		oField.value = '';
	}
}
function clearUsername()
{
	var objUsername = document.getElementById("txtUsername");
	if (objUsername.value == "Username")
	{
		objUsername.value = '';
	}
}
function clearPassword()
{
	var objPassword = document.getElementById("txtPassword");
	if (objPassword.value == "Password")
	{
		objPassword.value = '';
	}
}
function setDefaultUsername()
{
	var objUsername = document.getElementById("txtUsername");
	if (objUsername.value == "")
	{
		objUsername.value = 'Username';
	}
}
function setDefaultPassword()
{
	var objPassword = document.getElementById("txtPassword");
	if (objPassword.value == "")
	{
		objPassword.value = 'Password';
	}
}