if (document.images) {
    btn1up       = new Image();
    btn1up.src   = "images/SPSI_Home_02.gif" ;
    btn1down     = new Image() ;
    btn1down.src = "images/SPSI_Home2_02.gif" ;
	
	btn2up       = new Image();
    btn2up.src   = "images/SPSI_Home_03.gif" ;
    btn2down     = new Image() ;
    btn2down.src = "images/SPSI_Home2_03.gif" ;
	
	btn3up       = new Image();
    btn3up.src   = "images/SPSI_Home_04.gif" ;
    btn3down     = new Image() ;
    btn3down.src = "images/SPSI_Home2_04.gif" ;
	
	btn4up       = new Image();
    btn4up.src   = "images/SPSI_Home_05.gif" ;
    btn4down     = new Image() ;
    btn4down.src = "images/SPSI_Home2_05.gif" ;
	
	btn5up       = new Image();
    btn5up.src   = "images/SPSI_Home_16.gif" ;
    btn5down     = new Image() ;
    btn5down.src = "images/SPSI_Home2_16.gif" ;

}
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" );
    }
}