function clearField(element, value)
{
	if(document.getElementById(element).value == value)
	{
		document.getElementById(element).value = '';
	}
}

function fillField(element, value)
{	
	if(document.getElementById(element).value == '' || document.getElementById(element).value == null)
	{
		document.getElementById(element).value = value;
	}
}