function irA(menu){
window.location.href = menu.options[menu.selectedIndex].value;
}
///////// EVITA LETRAS EN CAMPOS NUMERICOS ///////////////
<!-- Begin
var nav4 = window.Event ? true : false;
function acceptNum(evt){
// NOTE: Backspace = 8, Enter = 13, '0' = 48, '9' = 57
var key = nav4 ? evt.which : evt.keyCode;
return (key <= 13 || key == 46 || (key >= 48 && key <= 57));
}
// End -->
<!-- Begin
var nav4 = window.Event ? true : false;
////////////////////////////////////////////

function acceptNum2(evt){
// NOTE: Backspace = 8, Enter = 13, '0' = 48, '9' = 57
var key = nav4 ? evt.which : evt.keyCode;
return (key <= 13  || (key >= 48 && key <= 57));
}
// End -->
//////////////// POPUP ///////////////////////////////////
<!-- Begin
function popUp(URL,Scroll,Ancho,Alto,Izq,Arriba,centrado) {
day = new Date();
id = day.getTime();
if (centrado==true){
	var altura_popup =Ancho;
	var Arriba = (screen.height - altura_popup) / 2;
	var anchura_popup =Alto;
	var Izq = (screen.width - anchura_popup) / 2; 
}
if(Scroll=="")Scroll=0;
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars="+Scroll+",location=0,statusbar=1,menubar=0,resizable=0,width="+Ancho+",height="+Alto+",left = "+Izq+",top = "+Arriba+"');");
}
// End -->
///////////////////////////////////////////////////////////
///////////////// COLORES A LA CELDAS/////////////////////
function uno(src,color_entrada) {if(color_entrada=="") color_entrada = "#F7F8E7";src.bgColor=color_entrada;src.style.cursor="default";}
function dos(src,color_default) {	if(color_default=="") color_default = "#FFFFFF";
src.bgColor=color_default;src.style.cursor="default";
}