String.prototype.isEmpty = function()
{
	return this.match(/^\s*$/);
}

String.prototype.isInteger = function()
{
	return this.match(/^[0-9]+$/);
}

String.prototype.makeInt = function()
{
	var result = new Array();
	var counter = 0;
	
	for( i = 0 ; i < this.length ; i++ )
	{
		if( this[i].isInteger() )
		{ 
			result[counter++] = this[i];
		}
	}
	
	if( result.length > 0 )
	{
		return parseInt( result.join('') );
	}
	
	return "";
}

String.prototype.isFloat = function()
{
	return this.match(/^([0-9]+|[0-9]+\.[0-9]+)$/);
}

String.prototype.isEmail = function()
{
	return this.match(/^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/);
}
String.prototype.isURL = function()
{
	return this.match(/^www+[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/);
}
String.prototype.isSiteName = function()
{
	return this.match(/^[a-z0-9][-a-z0-9]*$/i);
}
String.prototype.isString = function()
{
	return this.match(/^[a-zA-Z0-9._-]/);
}

function urlencode( str ) {
    // URL-encodes string  
    // 
    // version: 901.1411
    // discuss at: http://phpjs.org/functions/urlencode
    // +   original by: Philip Peterson
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +      input by: AJ
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Brett Zamir
    // %          note: info on what encoding functions to use from: http://xkr.us/articles/javascript/encode-compare/
    // *     example 1: urlencode('Kevin van Zonneveld!');
    // *     returns 1: 'Kevin+van+Zonneveld%21'
    // *     example 2: urlencode('http://kevin.vanzonneveld.net/');
    // *     returns 2: 'http%3A%2F%2Fkevin.vanzonneveld.net%2F'
    // *     example 3: urlencode('http://www.google.nl/search?q=php.js&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a');
    // *     returns 3: 'http%3A%2F%2Fwww.google.nl%2Fsearch%3Fq%3Dphp.js%26ie%3Dutf-8%26oe%3Dutf-8%26aq%3Dt%26rls%3Dcom.ubuntu%3Aen-US%3Aunofficial%26client%3Dfirefox-a'
                             
    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'] = '+';
    
    // 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;
}