str_replace parse error *** RESOLVED ***

[aaronskw]

I've got the following line of code in a php page:

$ProjectReference = str_replace("\","/",$ProjectReference); 

But I'm getting a parse error as follows:
Parse error: parse error, unexpected T_STRING in c:\inetpub\wwwroot\specac_test\ppc\nuaire_form_save.php on line 142

I've got a feeling it doesn't like the backslash, as other str replaces work ok?

Any ideas?