[CSS]Problem z przeglądarkami, Css Opcje

[x2008x]

Witam, mam problem.Na operze moja strona działa wporządku, wchodząc przez mozille nie jest już tak ładnie.Elementy są porozrzucane po rogach itd.

Co zrobić by strona wyglądała jednakowo dla Opery, Mozilli czy IE??
Dziękuję.

Mój CSS:

Kod

body {
  background-color: #3b3b3b;
  position: relative; top: -195px;



}

a {
text-decoration:none;
color: red;
font-weight:    bold;

}


#header2 {
  position: relative; top: 1px;
  text-align: center;
  width: 992px;
  height: 41px;
}


#zegar {

  background-color: #284e66;
  text-align: right;
  width: 170px;
  height: 25px;
}

#up {
  float: left;
  text-align: center;
}

#up ul { margin: 0; padding: 0; list-style-type: none; }

#up li { margin: 0 0 .2em 0; }

#up a { display: block; color: #67caf4; background-color: #284e66; width: 132px; padding: .2em .8em; text-decoration: none; }

#up a:hover{ background-color: #369; color: #67caf4; }




#header {
  position: relative; top: 1px;
  text-align: center;
  width: 992px;
  height: 155px;
}


#block {
  background-color: #3b3b3b;
  position: relative; left: 1px;
  width: 992px;
  height: 155px;
}



#Pmenu {
  position: relative; left: 826px;
  position: relative; top: 399px;
  text-align: center;
  background-color: #284e66;
  width: 160px;
  height: 59px;
  z-index: 3;
}

#menu {
  position: relative; left: 0px;
  position: relative; top: 0px;
  text-align: center;
  background-color: #284e66;
  width: 160px;
  height: 160px;
  z-index: 1;
  font-weight:    bold;
}

#menu ul { margin: 0; padding: 0; list-style-type: none; }

#menu li { margin: 0 0 .2em 0; }

#menu a { display: block; color: #67caf4; background-color: #284e66; width: 132px; padding: .2em .8em; text-decoration: none; font-weight:    bold; }

#menu a:hover{ background-color: #369; color: #67caf4; }

#log {
  position: relative; left: 826px;
  position: relative; top: 419px;
  text-align: center;
  background-color: #284e66;
  width: 160px;
  height: 59px;
  z-index: 3;
}


#news {
  background-color: #284e66;
  position: relative; left: 120px;
  font-family: arial;
  text-align: left;
  text-decoration:none;
  color: black;
  position: relative; top: -181px;
  float: left;
  width: 667px;
  height: 0px;
}

#send {
  background-color: #284e66;
  position: relative; left: 160px;
  font-family: arial;
  text-align: left;
  text-decoration:none;
  color: black;
  position: relative; top: -657px;
  float: left;
  width: 667px;
  height: 0px;
}

#info {
  background-color: #284e66;
  position: relative; left: 120px;
  text-align: left;
  position: relative; top: -181px;
  float: left;
  width: 667px;
  height: 30px;
  z-index: 10;
}



#download {
  background-color: #284e66;
  position: relative; left: 160px;
  font-family: arial;
  text-align: left;
  position: relative; top: -658px;
  float: left;
  width: 667px;
  height: 530px;
}

#koment {
  background-color: #284e66;
  position: relative; left: 160px;
  font-family: arial;
  text-align: left;
  position: relative; top: -657px;
  float: left;
  width: 667px;
  height: 500px;
}

#lmenudown {
  position: relative; left: 0px;
  position: relative; top: 0px;
  text-align: center;
  background-color: #284e66;
  width: 160px;
  height: 59px;
  z-index: 5;
}

#newsK {
  position: relative; left: -160px;
  text-align: center;
  position: relative; top: 0px;
  float: left;
  width: 667px;
  height: 30px;
}

#logout {
  background-color: #284e66;
  position: relative; left: 10px;
  position: relative; top: -137px;
  float: left;
  width: 667px;
  height: 500px;
}


a { color: #35dcff; }
a:hover { color: #0088df; }