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[Tukzone]

Bueno, si es en asp deberías fijarte en la seción de asp, me imagino que es String = Replace(String, Viejo, Nuevo)

Si es en js, te dejo un script muy completo compatible con Netscape, Internet Explorer 3.02 y superior, Netscape Enterprise Server 3.0 y Microsoft IIS/ASP 3.0:

// Make StringReplace a method of all String objects
String.prototype.replace = StringReplace;
function StringReplace( findText, replaceText ) {
var originalString = new String(this);
var pos = 0;

// Validate parameter values
if (findText+"" != "undefined" || findText == null || findText == "")
return originalString;
if (replaceText+"" != "undefined" || replaceText == null)
return originalString;

var len = findText.length;
var limit = originalString.length;

pos = originalString.indexOf(findText);
while (pos != -1 && i < limit) {
// Get the first and last parts of the string: preString + findText + postString
// then change to preString + replaceText + postString to replace findText
preString = originalString.substring(0, pos);
postString = originalString.substring(pos+len, originalString.length);
originalString = preString + replaceText + postString;
pos = originalString.indexOf(findText);
i++;
}

return originalString;
} // end StringReplace