function trim(str)
{
    str = leftTrim(str);
    str = rightTrim(str);
    return str;
}



function leftTrim(sString)
{
    while (sString.substring(0,1) == ' ')
    {
        sString = sString.substring(1, sString.length);
    }

    return sString;
}



function rightTrim(sString)
{
    while (sString.substring(sString.length-1, sString.length) == ' ')
    {
        sString = sString.substring(0,sString.length-1);
    }

    return sString;
}




function validateGroupPermissionForm(thisForm)
{
	var emptyMsg = "Please provide values for all fields indicated with '*'.";

	with (thisForm)
	{
		if (emptyValidation(groupID,emptyMsg) == false )
		{
			groupID.focus();
			return false;
		}

		if (emptyValidation(permissionID,emptyMsg) == false )
		{
			permissionID.focus();
			return false;
		}

		if (emptyValidation(expires,emptyMsg) == false )
		{
			expires.focus();
			return false;
		}

		if (dateValidation(expires,"Please enter a date in the indicated format.") == false )
		{
			expires.focus();
			return false;
		}


		if (emptyValidation(numUsers,emptyMsg) == false )
		{
			numUsers.focus();
			return false;
		}

		if (numUsersValidation(numUsers,emptyMsg) == false )
		{
			numUsers.focus();
			return false;
		}


	}

	return true;
}


function validatePermissionForm(thisform)
{
	var emptyMsg = "Please provide values for all fields indicated with '*'.";

	with (thisform)
	{
		if (emptyValidation(urlPattern,emptyMsg) == false )
		{
			urlPattern.focus();
			return false;
		}

	}

	return true;
}





function validateUserForm(thisform)
{
	var emptyMsg = "Please provide values for all fields indicated with '*'.";

	with (thisform)
	{
	    // Trim all values:
	    firstName.value = trim(firstName.value);
	    lastName.value = trim(lastName.value);
	    email.value = trim(email.value);
	    confirmEmail.value = trim(confirmEmail.value);

		if (emptyValidation(firstName,emptyMsg) == false )
		{
			firstName.focus();
			return false;
		}

		if (emptyValidation(lastName,emptyMsg) == false )
		{
			lastName.focus();
			return false;
		}

		if (emptyValidation(email,emptyMsg) == false )
		{
			email.focus();
			return false;
		}

		if( emailValidation(email,"Invalid email.") == false)
		{
			email.focus();
			return false;
		}

		if (emptyValidation(confirmEmail,emptyMsg) == false )
		{
			confirmEmail.focus();
			return false;
		}

		
		if( email.value != confirmEmail.value )
		{
			alert("Your email and confirmation email do not match.");
			confirmEmail.focus();
			return false;
		}
	}

	return true;
} 

function validateProductCodeForm(thisform)
{
    var emptyMsg = "Please provide values for all fields indicated with '*'.";

	with (thisform)
	{
		if (emptyValidation(permissionRoot,emptyMsg) == false )
		{
			permissionRoot.focus();
			return false;
		}

		if (emptyValidation(description,emptyMsg) == false )
		{
			description.focus();
			return false;
		}

		if (emptyValidation(swapPrefix,emptyMsg) == false )
		{
			swapPrefix.focus();
			return false;
		}
	}

	return true;
}



function validateGroupForm(thisform)
{
	var emptyMsg = "Please provide values for all fields indicated with '*'.";

	with (thisform)
	{
		if (emptyValidation(groupName,emptyMsg) == false )
		{
			groupName.focus();
			return false;
		}

		if (emptyValidation(contactName,emptyMsg) == false )
		{
			contactName.focus();
			return false;
		}

		if (emptyValidation(email,emptyMsg) == false )
		{
			email.focus();
			return false;
		}

		if( emailValidation(email,"Invalid email.") == false)
		{
			email.focus();
			return false;
		}


		if (emptyValidation(contactPhone,emptyMsg) == false )
		{
			contactPhone.focus();
			return false;
		}

		if (emptyValidation(teacherLaunchPage,emptyMsg) == false )
		{
			teacherLaunchPage.focus();
			return false;
		}

		if (emptyValidation(studentLaunchPage,emptyMsg) == false )
		{
			studentLaunchPage.focus();
			return false;
		}

	}

	return true;
}






function validateLoginForm(thisform)
{
	var emptyMsg = "Please provide a username and password to login.";	

	with (thisform)
	{
		if (emptyValidation(userName,emptyMsg) == false )
		{
			userName.focus();
			return false;
		}

		if (emptyValidation(pwd,emptyMsg) == false )
		{
			pwd.focus();
			return false;
		}
    }

}

function validateLogoutForm(thisform)
{
	var emptyMsg = "Please provide a username and password to logout.";	

	with (thisform)
	{
		if (emptyValidation(userName,emptyMsg) == false )
		{
			userName.focus();
			return false;
		}

		if (emptyValidation(pwd,emptyMsg) == false )
		{
			pwd.focus();
			return false;
		}
    }

}


function validateEmailPasswordForm(thisform)
{
	var emptyMsg = "Please provide your email address.";

	with (thisform)
	{
		if (emptyValidation(email,emptyMsg) == false )
		{
			email.focus();
			return false;
		}

		if( emailValidation(email,emptyMsg) == false)
		{
			email.focus();
			return false;
		}

    }

    return true;
}



function emptyValidation(entered, alertbox)
{
	with (entered)
	{
		if (value == null || value == "")
		{
			if (alertbox != "")
			{
				alert(alertbox);
			}
			
			return false;
		}
		else
		{
			return true;
		}
	}
}




function emailValidation(entered, alertbox)
{
	with (entered)
	{
        if( echeck(value) == false )
        {
            if (alertbox)
            {
                alert(alertbox);
            }

            return false;
        }
        else
        {
            return true;
        }
    }

}


function dateValidation(entered, alertbox)
{
    // We are expecting YYYY-MM-DD, 10 characters:
    dateString = entered.value;
    if( dateString.length != 10 )
    {
        if (alertbox)
        {
            alert(alertbox);
        }

        return false;
    }

    for (i = 0; i < dateString.length; i++)
    {
        theChar = dateString.charAt(i);
        if( i != 4 && i != 7 )
        {
            if( !isDigit(theChar) )
            {
                if (alertbox)
                {
                    alert(alertbox);
                }

                return false;
            }
        }
        else
        {
            if( theChar != '-' )
            {
                if (alertbox)
                {
                    alert(alertbox);
                }

                return false;
            }
        }
    }

    return true;
}





function numUsersValidation(entered, alertBox)
{
    numUsers = entered.value;
    for (i = 0; i < numUsers.length; i++)
    {
        theChar = numUsers.charAt(i); 
        if ( !isDigit(theChar) )
        {
            if (alertbox)
            {
                alert(alertbox);
            }

            return false;
        }
    }

    return true;

}

function isDigit(num)
{
	if (num.length>1)
	{
	    return false;
    }
	var string="1234567890";
	if (string.indexOf(num) != -1)
	{
	    return true;
    }

	return false;
}


function isEmailChar(ch)
{
	if (ch.length > 1)
	{
	    return false;
    }

	var string="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._@";
	if (string.indexOf(ch) != -1)
	{
	    return true;
    }

	return false;
}


///////////////////////


function echeck(str) {

		var at = "@"
		var dot = "."
		var lat = str.indexOf(at)
		var lstr = str.length
		var ldot = str.indexOf(dot)

		if (str.indexOf(at) == -1 || str.indexOf(at) == 0 || str.indexOf(at) == lstr)
		{
		   return false
		}

		if (str.indexOf(dot) == -1 || str.indexOf(dot) == 0 || str.indexOf(dot) == lstr)
		{
		    return false
		}

		if (str.indexOf(at,(lat+1)) != -1)
		{
		   return false
		}

		if (str.substring(lat-1,lat) == dot || str.substring(lat+1,lat+2) == dot)
		{
		   return false
		}

		if (str.indexOf(dot,(lat+2)) == -1)
		{
		   return false
		}

		if (str.indexOf(" ") != -1)
		{
		   return false
		}

		// Check for bogus chars:
        for (i = 0; i < str.length; i++)
        {
            ch = str.charAt(i);
            if( isEmailChar(ch) == false )
		        return false;
        }

 		 return true
	}