function selRata(obj){
	rataObj = eval('objForm.selectedTipoRata');
	sel = obj.selectedIndex;
	if (sel == 0){
		rataObj.length = 0;
		rataObj.disabled = true;
	}
	
	if (sel == 1){
		rataObj.disabled = false;
		rataObj.length = 0;
		for (i=0;i<fixArr.length;i++){
			rataObj.options[i] = new Option(fixArr[i],fixArr[i]);
		}
	}
	if (sel == 2){
		rataObj.disabled = false;
		rataObj.length = 0;
		rataObj.options[0]  = new Option("10%","10%");
		rataObj.options[1]  = new Option("5%","5%");
	}
		
}
fixArr = new Array('70 Euro','100 Euro','120 Euro','150 Euro','180 Euro','200 Euro','230 Euro','250 Euro','300 Euro','360 Euro','410 Euro','460 Euro','510 Euro','610 Euro','770 Euro','1030 Euro');