http://msdn2.microsoft.com/en-us/library/238kz954.aspxReplace(expression, find, replacewith[, start[, count[, compare]]])
expression
Required. String expression containing substring to replace.
find
Required. Substring being searched for.
replacewith
Required. Replacement substring.
start
Optional. Position within expression where substring search is to begin. If omitted, 1 is assumed. Must be used in conjunction with count.
count
Optional. Number of substring substitutions to perform. If omitted, the default value is -1, which means make all possible substitutions. Must be used in conjunction with start.
compare
Optional. Numeric value indicating the kind of comparison to use when evaluating substrings. See Settings section for values. If omitted, the default value is 0, which means perform a binary comparison.