function serializar(formulario){

var i 
var cadena = ""

	for (i=0;i<formulario.length;i++){
		cadena +=  formulario[i].name+"="+escape(formulario[i].value)+"&"
	}
	return(cadena)
}


function serializar2(formulario){
var i, j
var cadena = "";
	for (i=0;i<formulario.length;i++){
		if(formulario[i].type == "checkbox"){ // checkbox
			if (formulario[i].length == undefined) {
				if (formulario[i].checked) cadena +=  formulario[i].name+"="+escape(formulario[i].value)+"&";
			} else {
				for (j=0;j<formulario[i].length;j++){
					if (formulario[i][j].checked) cadena +=  formulario[i][j].name+"="+escape(formulario[i][j].value)+"&";
				}				
			}
		}
		else if (formulario[i].type == "radio"){ // radiobutton
			if (formulario[i].checked) cadena +=  formulario[i].name+"="+escape(formulario[i].value)+"&";
		}
		else if (formulario[i].type == "select-multiple") {
			for (j=0; j<formulario[i].length;j++){
				if (formulario[i][j].selected) cadena +=  formulario[i].name+"="+escape(formulario[i][j].value)+"&";
			}
		}
		else// resto de tipos de campos
			cadena +=  formulario[i].name+"="+escape(formulario[i].value)+"&"
	}
	return(cadena);
}