if (document.images) {

// items passief
var go01_off = new Image();
go01_off.src = "images/gobutton_off.gif"
var go02_off = new Image();
go02_off.src = "images/gobutton_off.gif"

// items actief
var go01_on = new Image();
go01_on.src = "images/gobutton_on.gif"
var go02_on = new Image();
go02_on.src = "images/gobutton_on.gif"
}