var itemNum = "4";
var itemCurrent = 0;
function form_go(step) {
	itemCurrent += step;
	if (itemCurrent<=0) {
		itemCurrent = 1;
	} else if (itemCurrent>itemNum) {
		obj_1 = document.getElementById("frmMain");
		if (obj_1) {
			alert("Submit data now...");
			obj_1.submit();
		}
		return;
	}
	
	// update the fields
	gObj_1 = document.getElementById("divFormMain");
	gObj_2 = document.getElementById("divForm_" + itemCurrent);
	if (gObj_1 && gObj_2) {
		gObj_1.innerHTML = gObj_2.innerHTML;
	}
	
}