function fileSize(file_url)
{
  var request;
  request = $.ajax({
    type: "HEAD",
    url: $(file_url).val(),
    success: function () {
      return request.getResponseHeader("Content-Length");
    }
  });
}

function isArray(obj) {

	if (empty(obj))
		return false;
	
   if (obj.constructor.toString().indexOf("Array") == -1)
      return false;
   else
      return true;
}

function empty (mixed_var) {
    // version: 1004.2314
    // discuss at: http://phpjs.org/functions/empty    // +   original by: Philippe Baumann
    var key;    
    if (mixed_var === "" ||
        mixed_var === 0 ||
        mixed_var === "0" ||
        mixed_var === null ||        mixed_var === false ||
        typeof mixed_var === 'undefined'
    ){
        return true;
    } 
    if (typeof mixed_var == 'object') {
        for (key in mixed_var) {
            return false;
        }        return true;
    } 
    return false;
}

//Removes duplicates in the array
function unique(a) {
	tmp = new Array(0);
	for(i=0;i<a.length;i++){
		if(!in_array(tmp, a[i])){
			tmp.length+=1;
			tmp[tmp.length-1]=a[i];
		}
	}
	return tmp;
}

//copy of the php function by the same name 
//returns true if item is found in the array
function in_array (needle, haystack, argStrict) 
{
    var key = '', strict = !!argStrict; 
    if (strict) {
        for (key in haystack) {
            if (haystack[key] === needle) 
			{
                return true;
			}
        }
    } else {
        for (key in haystack) {
            if (haystack[key] == needle) {               
				return true;
            }
        }
    }
     return false;
}

//remove item (string or number) from an array
function removeItem(originalArray, itemToRemove) 
{
	var j = 0;
	while (j < originalArray.length) 
	{
		if (originalArray[j] == itemToRemove) 
		{
			originalArray.splice(j, 1);
		} 
		else 
		{ 
			j++; 
		}
	}
	
	return originalArray;
}

/**
*
*  Javascript cookies
*
**/
 
function CookieHandler() {
 
	this.setCookie = function (name, value, seconds) {
 
		if (typeof(seconds) != 'undefined') {
			var date = new Date();
			date.setTime(date.getTime() + (seconds*1000));
			var expires = "; expires=" + date.toGMTString();
		}
		else {
			var expires = "";
		}
 
		document.cookie = name+"="+value+expires+"; path=/";
	}
 
	this.getCookie = function (name) {
 
		name = name + "=";
		var carray = document.cookie.split(';');
 
		for(var i=0;i < carray.length;i++) {
			var c = carray[i];
			while (c.charAt(0)==' ') c = c.substring(1,c.length);
			if (c.indexOf(name) == 0) return c.substring(name.length,c.length);
		}
 
		return null;
	}
 
	this.deleteCookie = function (name) {
		this.setCookie(name, "", -1);
	}
 
}

function str_replace (search, replace, subject, count) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   improved by: Gabriel Paderni
    // +   improved by: Philip Peterson
    // +   improved by: Simon Willison (http://simonwillison.net)
    // +    revised by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
    // +   bugfixed by: Anton Ongson
    // +      input by: Onno Marsman
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +    tweaked by: Onno Marsman
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // +   input by: Oleg Eremeev
    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Oleg Eremeev
    // %          note 1: The count parameter must be passed as a string in order
    // %          note 1:  to find a global variable in which the result will be given
    // *     example 1: str_replace(' ', '.', 'Kevin van Zonneveld');
    // *     returns 1: 'Kevin.van.Zonneveld'
    // *     example 2: str_replace(['{name}', 'l'], ['hello', 'm'], '{name}, lars');
    // *     returns 2: 'hemmo, mars'

    var i = 0, j = 0, temp = '', repl = '', sl = 0, fl = 0,
            f = [].concat(search),
            r = [].concat(replace),
            s = subject,
            ra = r instanceof Array, sa = s instanceof Array;
    s = [].concat(s);
    if (count) {
        this.window[count] = 0;
    }

    for (i=0, sl=s.length; i < sl; i++) {
        if (s[i] === '') {
            continue;
        }
        for (j=0, fl=f.length; j < fl; j++) {
            temp = s[i]+'';
            repl = ra ? (r[j] !== undefined ? r[j] : '') : r[0];
            s[i] = (temp).split(f[j]).join(repl);
            if (count && s[i] !== temp) {
                this.window[count] += (temp.length-s[i].length)/f[j].length;}
        }
    }
    return sa ? s : s[0];
}