Here is an example taken from the Scripting Guide
Help==>Books==>Scripting Guide
Import Images from a Web Page
You can import images on the web into a data table, using the Expression data type. The following example creates a new data table and adds two images to it.
dt = New Table( "test", New Column( "Image", Expression ) );
dt << Add Rows( 1 );
dt:Image = New Image( Open( "http://www.jmp.com/support/help/13/images/MosaicPlot.png" ) );
dt << Add Rows( 1 );
dt:Image = New Image( Open( "http://www.jmp.com/support/help/13/images/tTest_NoLoc.png" ) );
Jim