function urlencode( str ) {
 
    var histogram = {}, tmp_arr = [];
    var ret = (str+'').toString();
 
    var replacer = function(search, replace, str) {
        var tmp_arr = [];
        tmp_arr = str.split(search);
        return tmp_arr.join(replace);
    };
 
    // The histogram is identical to the one in urldecode.
    histogram["'"]   = '%27';
    histogram['(']   = '%28';
    histogram[')']   = '%29';
    histogram['*']   = '%2A';
    histogram['~']   = '%7E';
    histogram['!']   = '%21';
    histogram['%20'] = '+';
    histogram['\u20AC'] = '%80';
    histogram['\u0081'] = '%81';
    histogram['\u201A'] = '%82';
    histogram['\u0192'] = '%83';
    histogram['\u201E'] = '%84';
    histogram['\u2026'] = '%85';
    histogram['\u2020'] = '%86';
    histogram['\u2021'] = '%87';
    histogram['\u02C6'] = '%88';
    histogram['\u2030'] = '%89';
    histogram['\u0160'] = '%8A';
    histogram['\u2039'] = '%8B';
    histogram['\u0152'] = '%8C';
    histogram['\u008D'] = '%8D';
    histogram['\u017D'] = '%8E';
    histogram['\u008F'] = '%8F';
    histogram['\u0090'] = '%90';
    histogram['\u2018'] = '%91';
    histogram['\u2019'] = '%92';
    histogram['\u201C'] = '%93';
    histogram['\u201D'] = '%94';
    histogram['\u2022'] = '%95';
    histogram['\u2013'] = '%96';
    histogram['\u2014'] = '%97';
    histogram['\u02DC'] = '%98';
    histogram['\u2122'] = '%99';
    histogram['\u0161'] = '%9A';
    histogram['\u203A'] = '%9B';
    histogram['\u0153'] = '%9C';
    histogram['\u009D'] = '%9D';
    histogram['\u017E'] = '%9E';
    histogram['\u0178'] = '%9F';
 
    // Begin with encodeURIComponent, which most resembles PHP's encoding functions
    ret = encodeURIComponent(ret);
 
    for (search in histogram) {
        replace = histogram[search];
        ret = replacer(search, replace, ret) // Custom replace. No regexing
    }
 
    // Uppercase for full PHP compatibility
    return ret.replace(/(\%([a-z0-9]{2}))/g, function(full, m1, m2) {
        return "%"+m2.toUpperCase();
    });
 
    return ret;
}
 
 
function urldecode( str ) {
 
    var histogram = {};
    var ret = str.toString();
 
    var replacer = function(search, replace, str) {
        var tmp_arr = [];
        tmp_arr = str.split(search);
        return tmp_arr.join(replace);
    };
 
    // The histogram is identical to the one in urlencode.
    histogram["'"]   = '%27';
    histogram['(']   = '%28';
    histogram[')']   = '%29';
    histogram['*']   = '%2A';
    histogram['~']   = '%7E';
    histogram['!']   = '%21';
    histogram['%20'] = '+';
    histogram['\u20AC'] = '%80';
    histogram['\u0081'] = '%81';
    histogram['\u201A'] = '%82';
    histogram['\u0192'] = '%83';
    histogram['\u201E'] = '%84';
    histogram['\u2026'] = '%85';
    histogram['\u2020'] = '%86';
    histogram['\u2021'] = '%87';
    histogram['\u02C6'] = '%88';
    histogram['\u2030'] = '%89';
    histogram['\u0160'] = '%8A';
    histogram['\u2039'] = '%8B';
    histogram['\u0152'] = '%8C';
    histogram['\u008D'] = '%8D';
    histogram['\u017D'] = '%8E';
    histogram['\u008F'] = '%8F';
    histogram['\u0090'] = '%90';
    histogram['\u2018'] = '%91';
    histogram['\u2019'] = '%92';
    histogram['\u201C'] = '%93';
    histogram['\u201D'] = '%94';
    histogram['\u2022'] = '%95';
    histogram['\u2013'] = '%96';
    histogram['\u2014'] = '%97';
    histogram['\u02DC'] = '%98';
    histogram['\u2122'] = '%99';
    histogram['\u0161'] = '%9A';
    histogram['\u203A'] = '%9B';
    histogram['\u0153'] = '%9C';
    histogram['\u009D'] = '%9D';
    histogram['\u017E'] = '%9E';
    histogram['\u0178'] = '%9F';
 
    for (replace in histogram) {
        search = histogram[replace]; // Switch order when decoding
        ret = replacer(search, replace, ret) // Custom replace. No regexing   
    }
 
    // End with decodeURIComponent, which most resembles PHP's encoding functions
    ret = decodeURIComponent(ret);
 
    return ret;
}

//Add more fields dynamically.
function addField(area,field,limit,coluna) {
	if(!document.getElementById) return; //Prevent older browsers from getting any further.
		var field_area = document.getElementById(area);
		var all_inputs = field_area.getElementsByTagName("input"); //Get all the input fields in the given area.
		//Find the count of the last element of the list. It will be in the format '<field><number>'. If the
		// field given in the argument is 'friend_' the last id will be 'friend_4'.
		var last_item = all_inputs.length - 1;
		var last = all_inputs[last_item].id;
		var pos1 = last.indexOf("[")+1;
		var pos2 = last.indexOf("]");
		var count = Number(last.substr(pos1,(pos2-pos1)))+1;
	//If the maximum number of elements have been reached, exit the function.
	// If the given limit is lower than 0, infinite number of fields can be created.
	if(count > limit && limit > 0) return;
	//Add more fields dynamically.
	
	if(document.createElement) { //W3C Dom method.rand
		var rand = (Math.round((Math.random()*200)+1));
		var foo = new Date;
		var time = foo.getTime();
		var li = document.createElement("li");
		var input = document.createElement("input");
		var nomeid = field+'[novos]['+(time+rand)+']['+coluna+']'
		
		input.id = nomeid;
		input.name = nomeid;
		input.type = "text"; //Type of field - can be any valid input type like text,file,checkbox etc.
		li.appendChild(input);
		field_area.appendChild(li);
	} else { //Older Method
		field_area.innerHTML += "<li><input name='"+nomeid+"' id='"+nomeid+"' type='text' /></li>";
	}
}

function clear(campo){
	document.informe.campo.value = '';
}

<!--//
function display(id) {
	if (document.getElementById) {
		document.getElementById(id).style.display = "";
	}else if (document.layers) {
		document.layers[id].visibility = "show";
	}else if (document.all) {
		document.all[id].style.visibility = "visible";
	}else {
		//alert('Unknown browser category.');
	}
	return true;
}

function hide(id) {
	if (document.getElementById) {
		document.getElementById(id).style.display = "none";
	}else if (document.layers) {
		document.layers[id].visibility = "hide";
	}else if (document.all) {
		document.all[id].style.visibility = "hidden";
	}else {
		//alert('Unknown browser category.');
	}
	return true;
}

function inputSwitch(IDvalid, arrayIDremove){
	if(document.getElementById(IDvalid).value.length > 0){
		for (i in arrayIDremove) { 
			if(document.getElementById(arrayIDremove[i]) != null ){
				hide(arrayIDremove[i]);
			}
		};
	}else{
		for (i in arrayIDremove) { 
			if(document.getElementById(arrayIDremove[i]) != null ){
				display(arrayIDremove[i]);
			}
		};
	}
}
//-->

/* DOM */
	$(document).ready(function(){
		
		// Encoda campo titulourl do formulario de notícias
//		texto = urldecode($("#titulourl").val());
//		$("#titulourl").val(texto);
	});