Check for graphic

I have some that’s supposed to detect a gif or jpg and display it if it’s there.
Now it’s only displaying gif’s. If the graphic is a jpg it try’s to display as a gif.
Any help is appreciated.
var jpg = new Image();
jpg.src = “$path/members/$user/graphics/” + db_id + “.jpg”;
if(jpg.src){
var pict =”<img src=’$sec_owner_url/members/$user/graphics/” + db_id + “.jpg’ width=’60’> “;
}
else{ var pict=””; }

var gif = new Image();
gif.src = “$path/members/$user/graphics/” + db_id + “.gif”;
if(gif.src){
var pict =”<img src=’$sec_owner_url/members/$user/graphics/” + db_id + “.gif’ width=’60’> “;
}
else{ var pict=””; }

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