var mach1 = "images/machine.gif";
var mach2 = "images/MoriSeiki.jpg";
var mach3 = "images/Gild3.jpg";
var mach4 = "images/okuma2.jpg";
var MachNumber=1;
var NumberOfMach=4;
var HowLongBetweenMach=4;

function SwitchMach(counter){
if(counter < HowLongBetweenMach){
counter++;
document.mach.src = eval("mach" + MachNumber);
CallSwitchMach=window.setTimeout("SwitchMach("+counter+")",1500);
}
else{
if(MachNumber < NumberOfMach){
MachNumber++;
SwitchMach(0);
}
else{
MachNumber=1;
SwitchMach(0);
}
}
}