WARNING su codice, ma perchè che funziona

[arn]

Ho questo messaggio, ma il codice funziona ??? Cosa intende???


**Warning** Scene=Scene 1, Layer=Actions- bordi vari, Frame=1: Line 31: Case-insensitive identifier 'string' will obscure built-in object 'String'.
string=before+replace+after


questo il codice:

String.prototype.remove = function (strng) {
var temparray = this.split(strng);
return temparray.join("");
}
String.prototype.isEmail = function() {
if (!this) {
return false;
}
var iChars = "*|,\":<>[]{}`';()&$#%";
for (var i=0; i<this.length; i++) {
if (iChars.indexOf(this.charAt(i)) != -1) {
return false;
}
}
if(this.indexOf("@") == -1) return false;
if(this.indexOf(".") == -1) return false;

return true;
}
String.prototype.searchreplace=function(find,repla ce) {
var string=this
var counter
while (counter<string.length) {
var start = string.indexOf(find, counter);
if (start == -1) {
break;
} else {
var before=string.substr(0,start)
var after=string.substr(start+find.length,string.lengt h)
string=before+replace+after
var counter=before.length+replace.length

}
}
return string;
}

[dioz]

string=before+replace+after

rinomina la variabile string in stringa