[jQuery] Error on prepend in IE7

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Hey all.

I'm using jQuery with flexigrid and when the table displayes in IE7, I
get a JS error.

Here is the JS error and block of code it references.

unexpected call to method or property access

prepend: function() {
                return this.domManip(arguments, true, function(elem){
                        if (this.nodeType == 1)
                                this.insertBefore( elem, this.firstChild );
                });
        },

At first I thought it might be having additional tags inside the table
cell data but I removed all the tags and I still get this error.

Any ideas?