html - jQuery change folder with css change -


i trying change folders contain images when div changes. using media queries change div on page load. need jquery check size div has been set , change image folder accordingly. example if max-width of div 700px want jquery change string photography/mobile/ photography/fullscreen/ original string photography/fullscreen/stage.jpg not want whole string change, word fullscreen, mobile or tablet. ok css jquery awful learning!

here code jquery not working images not changing when media queries do:

    <!doctype html> <html>  <head>   <title>change image!</title>    <style type="text/css">     #surround{position: relative; margin: 0px auto; width: 100%; max-width: 700px; height: 467px; border: 1px solid black;}     @media screen , (max-width:800px){ #surround{max-width: 400px; height: 262px; border: 1px solid blue;} }     @media screen , (max-width: 500px){ #surround{max-width: 200px; height: 133px; border: 1px solid red;} }   </style>    <script type="text/javascript" src="js/jquery.js"></script>   <script type="text/javascript" src="js/init.js"></script> </head>  <body>  <div id="surround">   <image src="photography/fullscreen/stage.jpg" class="picture" /> </div>  </body> </html>    $(document).ready(function(){   if($("#surround").css("max-width") == "700px"){   $("img").each(function(){   $(this).attr("src", $(this).attr("src")("photography/fullscreen/"));   });   }    if($("#surround").css("max-width") == "400px"){   $("img").each(function(){   $(this).attr("src", $(this).attr("src")("photography/tablet/"));   });   }    if($("#surround").css("max-width") == "200px"){   $("img").each(function(){   $(this).attr("src", $(this).attr("src")("photography/mobile/"));   });   } });

try - replace subdirectory part of src attribute new target_subdir value. modified encapsulation, caching selected elements, , code re-use (very important things in software development).

function changeimgsrc(target_subdir) {     $("img").each(function() {         var replacementsrc = $(this).attr("src").replace(             /photography\/(\w*)\//,             "photography/"+target_subdir+"/"         );         $(this).attr("src", replacementsrc);     }); }  $(document).ready(function() {     var $surround = $("#surround");     var $surroundmaxwidth = $surround.css("max-width");     if ($surroundmaxwidth == "700px") {         changeimgsrc("fullscreen");     }      if ($surroundmaxwidth == "400px") {         changeimgsrc("mobile");     }      if ($surroundmaxwidth == "200px") {         changeimgsrc("tablet");     } });

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