1st problem

/* CSS Document */

body {background-image:url(images/background.jpg); background-repeat:repeat-x; background-color:#3c4752; background-attachment:fixed}
#container {width:1100px; margin:auto;}
#titlu {background-image:url(images/titlu.png); background-repeat:no-repeat; width:350px; height:100px; float:left; margin-left:10px; margin-top:10px;}
#navigation {background-image:url(images/navigator.png); background-repeat:no-repeat; width:507px; height:59px; float: right; margin-top:7px; margin-right:2px;}
.nav_menu li {list-style:none;     display:inline;     padding-left: 10px;     padding-right: 10px;     float: left;     padding-top: 3px; }
.nav_menu li a {color:#3FF; text-decoration:none; font-size:14px; font-weight:bold;}
.nav_menu li a:hover {color:#0F0; text-decoration:underline; font-size:14px; font-weight:bold;}
#content_stanga {float:left; width:525px; height:320px;}
#ce_este {background-image:url(images/ce-este.png); background-repeat:no-repeat; width:277px; height:63px; margin-top:150px; margin-left:5px;}
#sus {background-image:url(images/bottom-up.png); background-repeat:no-repeat; width:525px; height:34px;}
#centru {background-image:url(images/bottom-center.png); background-repeat:no-repeat;width:525px; height:320px; }
#jos {background-image:url(images/bottom-down.png); background-repeat:no-repeat; width:525px; height:34px;}

#centru_div {width:490px; height:300px; overflow:hidden; padding-top:15px; padding-left:18px; padding-right:4px;}

#content_dreapta {float:right;width:525px; height:320px;}
#cum_pot {background-image:url(images/cum-pot.png); width:222px; height:63px; background-repeat:no-repeat;}