Simple javascript / jquery window resize question -

i'm writting small script detect if window size larger initial screen size, write jquery handle css. problem i'm having if zoom in 1 notch on mouse wheel (ctrl + wheel scroll) works fine, zoom 1 notch doesn't go original value.

so screen 1920px wide. zoom in 1 notch on wheel, screen 1586px, fine. when zoom out 1 notch on wheel screen should 1920px (theoretically) it's not. zooms out 1903px , can't figure out why won't go 1920px.

here code, if more explanation or clarification needed, please let me know.

    var intinitialsize = {width: screen.width, height: screen.height}; var intwindowsize = {width: $(window).width(), height: $(window).height()}; var int125;  $(window).load(function() {         calcmargin(); }).resize(function() {     intwindowsize = {width: $(this).width(), height: $(this).height()};     //int125 = math.round(math.abs((intwindowsize.width * 1.25)));      calcmargin(); });  function calcmargin() {     console.log(intinitialsize.width, intwindowsize.width);     if (intinitialsize.width >= intwindowsize.width) {         // css stuff!     }     else {         // other css stuff!     } }