function change_class(id, newClass) 
	{
	identity=document.getElementById(id);
	identity.className=newClass;
	}

function swap_class(id, Class1, Class2) 
	{
	identity=document.getElementById(id);
	
	if ( identity.className==Class1 ) 
		{
		identity.className=Class2;
		}
	else 
		{
		identity.className=Class1;
		}
	}

function empty_contents(id)
	{
	identity = document.getElementById(id);
	
	identity.innerHTML= "";
	}

function update_contents(id, contents)
	{
	identity = document.getElementById(id);
	
	identity.innerHTML= contents;
	}

function swap_contents(id, Contents1, Contents2) 
	{
	identity=document.getElementById(id);
	
	if ( identity.innerHTML==Contents1 ) 
		{
		identity.innerHTML=Contents2;
		}
	else 
		{
		identity.innerHTML=Contents1;
		}
	}

function toggle_disabled(id) 
	{
	identity=document.getElementById(id);

	if ( identity.disabled == true ) 
		{
		identity.disabled = false;
		}
	else 
		{
		identity.disabled = true;
		}
	}