try it like this:
$.each($('.gallery img'), function () {
var rndmnum = Math.floor((Math.random()*11)+1);
rndmnum = rndmnum *20 + 260;
$(this).css({
'max-width' : rndmnum
});
});
note: untested
sources:
https://stackoverflow.com/questions/8904707/javascript-random-number-between-15-and-225-increments-of-30
https://stackoverflow.com/questions/8733838/random-max-width-for-each-image-on-a-page
edit: corrected calculation
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