easy Code does not work

Hi, why does this code doesn't work? Normally this would be an easy code for me but now it doesn't work:

I want it to generate an url with some values look at it: var s :String;

var varname :String[];

var values :String[];

function getting(scriptname :String, varName :String[], values :String[]){

var url = "http://www.myurl.com/" + scriptname;

if(varName.Length > 0){

url = url + "?";

}

var i :int;

while (i <= varName.Length){

url = url + varName[i] + "=" + values[i] + "&";

i++;

}

return url;

}

function Start () {

s = getting("process.php", varname, values);

}

First of all there are no compiler errors but then the string "s" keeps being null and I get the following warning:

IndexOutOfRangeException: Array index is out of range. Verbindung.getting (System.String scriptname, System.String[] varName, System.String[] values) (at Assets/Verbindung.js:14) Verbindung.Start () (at Assets/Verbindung.js:23)