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