function toggleElementHiddenStyle(id)
{
	var element=document.getElementById(id);
	if (element.style.display == 'block')
	{
		element.style.display = 'none';
	} else
	{
		element.style.display = 'block';
	}
}

function checkCheckbox(checkboxId,on)
{
	var element=document.getElementById(checkboxId);
	
	if (element && element.checked)
		element.checked=on;
}