#btn_home a{background-image:url(images/en/home.png);}
#btn_home a:hover{background-position:0 -27px;}

#main_menu a#m1{background-image:url(images/en/m1.png);}
#main_menu a#m2{background-image:url(images/en/m2.png);}
#main_menu a#m3{background-image:url(images/en/m3.png);}
#main_menu a#m4{background-image:url(images/en/m4.png);}
#main_menu a#m5{background-image:url(images/en/m5.png);}
#main_menu a#m6{background-image:url(images/en/m6.png);}

#main_menu a#m1:hover, #main_menu a#m1.selected{background-image:url(images/en/m1a.png);}
#main_menu a#m2:hover, #main_menu a#m2.selected{background-image:url(images/en/m2a.png);}
#main_menu a#m3:hover, #main_menu a#m3.selected{background-image:url(images/en/m3a.png);}
#main_menu a#m4:hover, #main_menu a#m4.selected{background-image:url(images/en/m4a.png);}
#main_menu a#m5:hover, #main_menu a#m5.selected{background-image:url(images/en/m5a.png);}
#main_menu a#m6:hover, #main_menu a#m6.selected{background-image:url(images/en/m6a.png);}