.poisk{
position:fixed;
background-image:-webkit-linear-gradient(bottom,#426BFF,#60A5FF);
background-image:-moz-linear-gradient(bottom,#426BFF,#60A5FF);
background-image:-o-linear-gradient(bottom,#426BFF,#60A5FF);
background-image:linear-gradient(bottom,#426BFF,#60A5FF);
-webkit-box-shadow:0 0 3px black;
-moz-box-shadow:0 0 3px black;
-o-box-shadow:0 0 3px black;
box-shadow:0 0 3px black;
border:1px solid #404040;
left:-200px;
width:240px;
height:30px;
border-radius:3px;
top:100px;
color:white;
text-shadow:0 0 3px black;
-webkit-transition:all 0.4s ease;
-moz-transition:all 0.4s ease;
-o-transition:all 0.4s ease;
transition:all 0.4s ease;
padding:3px;
}
.poisk:hover{
left:-3px;
}
.poisk #search{
width:175px;
position:relative;
top:3px;
left:5px;
-webkit-transition: all 0.4s ease;
-moz-transition: all 0.4s ease;
-o-transition: all 0.4s ease;
transition: all 0.4s ease;
border-radius:3px;
border:1px solid #606060;
height:26px;
}
.poisk:hover #search{
width:230px;
}
#search{
-webkit-transition:all 0.2s ease;
-moz-transition:all 0.2s ease;
-o-transition:all 0.2s ease;
transition:all 0.2s ease;
}
#search:focus{
border:1px solid #404040;
-webkit-box-shadow:inset 1px 1px 3px #ccc;
-moz-box-shadow:inset 1px 1px 3px #ccc;
box-shadow:inset 1px 1px 3px #ccc;
}
.poisk:hover #poiskknopka{
display:none;
}

<div class="poisk"><form class="poick_os" onsubmit="document.getElementById('sfSbm').disabled=true" method="get" action="/search/"><input id="search" class="poick_pole" type="text" name="q" maxlength="45" value="Поиск..." onclick="if (this.value=='Поиск...'){this.value='';}" id="acpro_inp11" autocomplete="off"><span style="position:absolute;right: 10px;top: 6px;font-family: tahoma, sans-serif;font-size: 14px;font-style: normal;font-variant: normal;font-weight: normal;" id="poiskknopka"><img src="/search1.png"></span></form></div>