[JS CS3 and CS4] Place snippet at insertionPoint fails in CS3 but works in CS4

The following code will place a snippet at an insertion point to create an anchored object in CS4 but in CS3 it causes a crash.

var myImage = app.documents[0].pageItems.item("photo1");

var mySnippet1 = "temp1.inds"

myImage.exportFile(ExportFormat.indesignSnippet, File(mySnippet1));

AllParagraphs = app.documents[0].stories[0].paragraphs;    

AllParagraphs.item(i).insertionPoints[0].place(mySnippet1);

Can anyone explain why and is there an alternative method to avoid this crash?.

Thanks

Skemp.