setting a variable to a img src

here is the story, I have a first web page with a gridview on it, when I click a link it send me to another page with two values. a number and name.  I can assign the name to a string variable with request query string, but how do I assign that string variable to a IMG tag src property.  currently this is what the tag reads.
<img id = "BarcodeName" src="GetBarcode.aspx?text=<%=FullName %>.jpeg" alt="BARCODE" />
the GetBarcode.aspx is a page with some code behind that coverts the name to a barcode image, that works fine, it uses the value assigned to te ...