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copied!<p>I just finished my aim so I post my code here, I think it is the simplest way,and clear</p> <pre><code>$(document).ready(function() { var btns = { 'bg_o' : ['images/services/btn1.png','images/services/btn2.png','images/services/btn3.png','images/services/btn4.png'], 'bg_h' : ['images/services/btn1_hover.png','images/services/btn2_hover.png','images/services/btn3_hover.png','images/services/btn4_hover.png'], '$all_btn' : $('.all_btn'), '$folders':[$('#folder1'),$('#folder2'),$('#folder3'),$('#folder4')], 'folders_status':new Array('inactive','inactive','inactive','inactive') ,jquery_func : function(){ btns.$all_btn.each(function(){ $(this).click(function(){ for(i=0;i<4;i++){ var imageurl_o = new Array(); imageurl_o[i] = {'background-image':'url('+btns.bg_o[i]+')'}; btns.$folders[i].css(imageurl_o[i]); btns.folders_status[i]='inactive'; } for(i=0;i<4;i++){ var myparent = btns.$folders[i].parent(); if($(this).attr('class') == myparent.attr('class')){ var imageurl_h = {'background-image':'url('+btns.bg_h[i]+')'}; btns.$folders[i].css(imageurl_h); btns.folders_status[i]='active'; } } }); $(this).mouseover(function(){ for(i=0;i<4;i++){ var imageurl_o = new Array(); imageurl_o[i] = {'background-image':'url('+btns.bg_o[i]+')'}; if(btns.folders_status[i]=='inactive') btns.$folders[i].css(imageurl_o[i]); } for(i=0;i<4;i++){ var myparent = btns.$folders[i].parent(); if($(this).attr('class') == myparent.attr('class')){ var imageurl_h = {'background-image':'url('+btns.bg_h[i]+')'}; btns.$folders[i].css(imageurl_h); } } }); }); } } btns.jquery_func(); }); </code></pre>

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