var calendar_counter = 0;
var calendar_image_open = CTX + "/images/calendar/calendar.gif";
function setupCalendar(campo, rangeyears) {
	if(campo && !campo.getAttribute("disabled") && campo.getAttribute("type") != "hidden"){
		var rangeyearsaux = rangeyears || [1900, 2999];
		if (campo.id == "") campo.setAttribute("id", "calendar_input_" + calendar_counter++);
		var boton = document.createElement("IMG");
		boton.src = calendar_image_open;
		boton.className = "calendario";
		boton.setAttribute("id", "calendar_input_" + calendar_counter++);
		campo.parentNode.insertBefore(boton, campo.nextSibling);
		var cal = Calendar.setup({
			inputField  : campo.id,
			ifFormat    : "%d/%m/%Y",
			button    	: boton.id,
			electric    : false,
			cache		: true,
			align		: "Cb",
			range       : rangeyearsaux,
			weekNumbers : false
		});

		// Modificacion para que el popup del calendario no salga debajo de los popups de otros formularios
		var oldOnClick = boton.onclick;
		boton.onclick = function() {
			oldOnClick();
			if (window.calendar && window.calendar.element) window.calendar.element.style.zIndex = 2000;
		}
	}
}