I was trying to use Raphael JS graphics library. I would like to use the attribute gradient which should accept an object. Documentation says to refer to SVG specs. I found the gradient object in SVG, for instance 

```
<linearGradient id="myFillGrad" x1="0%" y1="100%" x2="100%" y2="0%">
<stop offset="5%" stop-color="red" />
<stop offset="95%" stop-color="blue" stop-opacity="0.5" />
</linearGradient>

```

but how can I reference that from within my javascript? 

```
circle.attr("gradient", "myFillGrad"); 

```

doesn't work :)
Thanks in advance