var position_form=1;
function form_next(){
	var n="form_" + (position_form+1);
	var c="form_" + position_form;
	if($(n)){
		position_form++;
		$(c).style.display="none";
		$(n).style.display="block";
	}
}
function form_previous(){
	var n="form_" + (position_form-1);
	var c="form_" + position_form;
	if($(n)){
		position_form--;
		$(c).style.display="none";
		$(n).style.display="block";
	}
}