default
{
   state_entry()
   {
       llSay( 0, "osSetDynamicTextureURL Tester");
   }
   touch_start(integer total_number)
   {
     llSay( 0, "Testing.");
     string  dynamicID="";
     integer refreshRate = 600;
     string  contentType="image";
     string srcURL = "http://www.yoururlgoeshere.com"; // URL
     string URLTexture=osSetDynamicTextureURL(dynamicID, contentType ,srcURL  , "", refreshRate );
     if (llStringLength(URLTexture)>0)
      {
        llSay(0,"URLTexture = "+URLTexture);
        llSetTexture(URLTexture, ALL_SIDES);
      }
  }
}

oder

default {
    state_entry()
    {
        llSay( 0, "osSetDynamicTextureURL Tester");
    }
    touch_start(integer total_number)
    {
      llSay( 0, "Testing.");
      string  dynamicID="";
      integer refreshRate = 600;
      string  contentType="image";
      string srcURL1 = "http://www.goes.noaa.gov/FULLDISK/GEVS.JPG"; // Earth
      string srcURL2 = "http://www.srh.noaa.gov/data/satellite/thumbs/ECI8.JPG"; // US Weather
      string srcURL = "http://ichart.finance.yahoo.com/b?s=%5EGSPC"; // Stock market
      string URLTexture=osSetDynamicTextureURL(dynamicID, contentType ,srcURL  , "", refreshRate ); 
      if (llStringLength(URLTexture)>0) 
       {
         llSay(0,"URLTexture = "+URLTexture);
         llSetTexture(URLTexture, ALL_SIDES);
       }
   }
}