function toggleHiddenDiv(elementId)
{
    var element = document.getElementById(elementId);
    if (element)
    {
        if (element.className == 'hidden_div')
        {
            element.className = 'visible_div';
        }
        else if (element.className == 'visible_div')
        {
            element.className = 'hidden_div';
        }
        else
        {
        	alert('Invalid class name for element ' + elementId);
        }
    }
    else
    {
        alert('Unable to find element ' + elementId);
    }
}

function toggleDisplay(elementId)
{
    var element = document.getElementById(elementId);
    if (element)
    {
        if (element.style.display == 'block' || element.style.display == '')
        {
            element.style.display = 'none';
        }
        else if (element.style.display == 'none')
        {
            element.style.display = 'block';
        }
        else
        {
        	alert('Invalid display value for element ' + elementId + ': ' + element.style.display);
        }
    }
    else
    {
        alert('Unable to find element ' + divId);
    }
}

function getRadioButtonValue(radioButton)
{
	for (i=0; i<radioButton.length; i++)
	{
		if (radioButton[i].checked == true)
		{
			return radioButton[i].value;
		}
	}
	
	return '';
}

function array_index_of(p_array, p_element)
{
	for (var i = 0; i < p_array.length; i++)
	{
		if (p_array[i] == p_element)
		{
			return i;
		}
	}
	
	return -1;
}

function array_contains(p_array, p_element)
{
	if (array_index_of(p_array, p_element) >= 0)
	{
		return true;
	}
	
	return false;
}