if (document.images) {
    homebuttonup       = new Image();
    homebuttonup.src   = "./images/jpgs/home_button_base_140x65px.jpg" ;
	homebuttonover       = new Image();
    homebuttonover.src   = "./images/jpgs/home_button_over_140x65px.jpg" ;
    homebuttondown     = new Image() ;
    homebuttondown.src = "./images/jpgs/home_button_down_140x65px.jpg";
	homebuttonselected     = new Image() ;
    homebuttonselected.src = "./images/jpgs/home_button_selected_140x65px.jpg";
	
	servicesbuttonup       = new Image();
    servicesbuttonup.src   = "./images/jpgs/services_button_base_140x65px.jpg" ;
	servicesbuttonover     = new Image() ;
    servicesbuttonover.src = "./images/jpgs/services_button_over_140x65px.jpg";
    servicesbuttondown     = new Image() ;
    servicesbuttondown.src = "./images/jpgs/services_button_down_140x65px.jpg";
	servicesbuttonselected     = new Image() ;
    servicesbuttonselected.src = "./images/jpgs/services_button_selected_140x65px.jpg";
	
	missionbuttonup       = new Image();
    missionbuttonup.src   = "./images/jpgs/mission_button_base_140x65px.jpg" ;
	missionbuttonover     = new Image() ;
    missionbuttonover.src = "./images/jpgs/mission_button_over_140x65px.jpg";
    missionbuttondown     = new Image() ;
    missionbuttondown.src = "./images/jpgs/mission_button_down_140x65px.jpg";
	missionbuttonselected     = new Image() ;
    missionbuttonselected.src = "./images/jpgs/mission_button_selected_140x65px.jpg";
	
	contactbuttonup       = new Image();
    contactbuttonup.src   = "./images/jpgs/contact_button_base_140x65px.jpg" ;
	contactbuttonover     = new Image() ;
    contactbuttonover.src = "./images/jpgs/contact_button_over_140x65px.jpg";
    contactbuttondown     = new Image() ;
    contactbuttondown.src = "./images/jpgs/contact_button_down_140x65px.jpg";
	contactbuttonselected     = new Image() ;
    contactbuttonselected.src = "./images/jpgs/contact_button_selected_140x65px.jpg";
}
function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}
function buttonover ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "over.src" );
    }
}
function buttonselected ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "selected.src" );
    }
}