// Esta función cargará las paginas
function cp(url, id_contenedor){
	var pagina_requerida = false
	
	if (window.XMLHttpRequest) {// Si es Mozilla, Safari etc
		pagina_requerida = new XMLHttpRequest()
	} else if (window.ActiveXObject){ // pero si es IE
		try {
			pagina_requerida = new ActiveXObject("Msxml2.XMLHTTP")
		} catch (e){ // en caso que sea una versión antigua
			try{
				pagina_requerida = new ActiveXObject("Microsoft.XMLHTTP")
			} catch (e){}
		}
	} else
		return false

		pagina_requerida.onreadystatechange=function(){// función de respuesta
		if (pagina_requerida.readyState == 4) {
           updatepage(pagina_requerida.responseText, id_contenedor)
        }else{
			updatepage('<div align="center"><img align="center" src="png/kata.gif" /></div>', id_contenedor)
		}
			
	}
	pagina_requerida.open('GET', url, true) // asignamos los métodos open y send
	pagina_requerida.send(null)
}

function mandaMensaje(strURL,formname,responsediv,responsemsg, alto) {
    var xmlHttpReq = false;
    var self = this;
    // Xhr per Mozilla/Safari/Ie7
    if (window.XMLHttpRequest) {
        self.xmlHttpReq = new XMLHttpRequest();
    }else if (window.ActiveXObject) {
        self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    self.xmlHttpReq.open('POST', strURL, true);
	
    self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    self.xmlHttpReq.onreadystatechange = function() {
        if (self.xmlHttpReq.readyState == 4) {
            updatepage(self.xmlHttpReq.responseText,responsediv);
        }else{
			updatepage('<div align="center" style="height:'+alto+'px;"><img src="'+responsemsg+'" /></div>',responsediv);
		}
    }
    self.xmlHttpReq.send(getquerystring(formname));
}

function getquerystring(formname) {
    var form = document.forms[formname];
	var qstr = "";

    function GetElemValue(name, value) {	
		
        qstr += (qstr.length > 0 ? "&" : "")
            + escape(name).replace(/\+/g, " ") + "="
            + unescape(value ? value : "").replace(/\s/g, "+");
			//+ unescape(value ? value : "").replace(/á1/g,"a");
			//+ escape(value ? value : "").replace(/\n/g, "%0D");
		//window.alert(qstr);
    }
	
	var elemArray = form.elements;
    for (var i = 0; i < elemArray.length; i++) {
        var element = elemArray[i];
        var elemType = element.type.toUpperCase();
        var elemName = element.name;
        if (elemName) {
            if (elemType == "TEXT"
                    || elemType == "TEXTAREA"
                    || elemType == "PASSWORD"
					|| elemType == "BUTTON"
					|| elemType == "RESET"
					|| elemType == "SUBMIT"
					|| elemType == "FILE"
					|| elemType == "IMAGE"
                    || elemType == "HIDDEN")
                GetElemValue(elemName, element.value);
            else if (elemType == "CHECKBOX" && element.checked)
                GetElemValue(elemName, 
                    element.value ? element.value : "On");
            else if (elemType == "RADIO" && element.checked)
                GetElemValue(elemName, element.value);
            else if (elemType.indexOf("SELECT") != -1)
                for (var j = 0; j < element.options.length; j++) {
                    var option = element.options[j];
                    if (option.selected)
                        GetElemValue(elemName,
                            option.value ? option.value : option.text);
                }
        }
    }
	
    return qstr;
}

function updatepage(str,responsediv){
    document.getElementById(responsediv).innerHTML = str;
}