Java EE (Java Enterprise Edition) General Discussion

I wrote the following function to replace single- and double-quote characters within a string, but I can't call the non-static StringBuffer.append method within this function. Could someone tell me how to replace all instance of a single character within a string with a different string in a JSP page?

<%!
public final String replaceString( String stringIn, char replaceMe, String withMe ) {
int i=0,
int len = stringIn.length();

StringBuffer newSB = new StringBuffer("");

if ( withMe.equals("") )
for ( i = 0 ; i < len ; i++ ){
if ( replaceMe == stringIn.charAt(i) ) {
StringBuffer.append(new Character(stringIn.charAt(i)).toString());
}
}
else
for ( i = 0 ; i < len ; i++ ){
if ( stringIn.charAt(i) == replaceMe ) {
StringBuffer.append(withMe);
}
}
return newSB.toString();
}
%>