function replace(string,text,by){
	var strLength = string.length, txtLength = text.length;
	if ((strLength == 0) || (txtLength == 0)) {return string;};
	var i = string.indexOf(text);
	if ((!i) && (text != string.substring(0,txtLength))) {return string;};
	if (i == -1) {return string;};
	var newstr = string.substring(0,i) + by;
	if (i+txtLength < strLength) {newstr += replace(string.substring(i+txtLength,strLength),text,by);};
	return newstr;
}