Is it possible to set the source of an image using the javascript: pseudo-protocol? -

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basically, have context i'm allowed create image, want run script before decide on source, i'm wondering if possible:

<img src="javascript:{load remote script , run figure out source}" />

the work-around i've come is:

<img src="any-old-image.gif" onload="document.write('<scr' + 'ipt src=\"http://mysite-script.js\"'></scr' + 'pt>');" />

but i'm hoping little cleaner possible.

p.s. i'm aware "javascript:" quote-unquote evil. special situation.

create function gathers whatever data need , sends server (via xmlhttprequest, or whatever method prefer). create function examines response server , decides image use. can set url image directly:

document.getelementbyid("myimage").src = myimagesrc;

edit: addressing comment.

if can muck img element itself, right, img.onload want. , if there's more couple of lines of script, importing script seems reasonable. maybe little bit cleaner document.write:

document.body.appendchild(document.createelement("script")).src =     "http://mysite.com/myscript.js";

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