javascript - How do I use variables in my href when downloading a file? -


javascript

i have 3 variables use define href downloading file:

var fselect; var uselect; var bselect;

so href defined variable this:

var savefile = '../files/' + fselect + uselect + bselect + '.x3g';

html

but how use in html document?

<a><img src="../save-button.png" alt="save" width="120" height="40" /></a>

give img tag id attribute (in case, i'm using img)
modify tag using dom 

document.getelementbyid("img").src = savefile;


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