$(document).ready(function(){
var trr = document.getElementsByClassName ("qw");
var count = trr.length;
j=1;
var color_prev;
for (i=1;i<trr.length;i++) {
               if (j == 1) {
                   $(trr[i]).css({"background":"#89a4f4"});
                j=0;
            
                } else {
                                                            j=1;
                                                          }                
                        }
$(".qw").mouseover(function(){
            color_prev = $(this).css("background-color");
            $(this).css({ "background":"#a6bbfa"});
            });
$(".qw").mouseout(function(){
            if (color_prev == "#89a4f4") {
                           $(this).css({"background":"#89a4f4"});
                    } else {
                    $(this).css({ "background":"#7393f3"});
                }
                                });
});