Question about the dynamic download

Hi all,

I have a question about download pic.

I want to do this.

I receive data from the website, I can get the text data first. then I show the text at the page. Meanwhile, I get the pic link. I will download the pic. But now, the problem is when I download the pic, the showing page will dead there until the pic download complete. 

Can I make the page alive when download pic? ( like the open a new thread to download the pic)

Thank you very much.