if (document.images) 
{
    homebuttonup       = new Image();
    homebuttondown     = new Image();

	homebuttonup.src   = "../pics/admin_dark.jpg" ;
    homebuttondown.src = "../pics/admin.jpg" ; //hover

}

function buttondown( buttonname ) //hover
{
    if (document.images) 
	{
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}

function buttonup ( buttonname )
{
    if (document.images) 
	{
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}