Как вариант...
<!DOCTYPE html>
<html>
<head>
<title>test</title>
<script>
function Go() {
var o = document.getElementById('divForm')
var h=(o.style.height)? parseInt(o.style.height): 100
o.style.height=((h==100)? 200: 100) + 'px'
}
</script>
<style>
#divForm {
width: 200px;
height: 100px;
overflow: hidden;
border: 1px solid;
}
#podrobnee {
width: 100px;
height: 150px;
margin: 10px;
background-color: red;
}
</style>
</head>
<body>
<div id='divForm'>
<div id='podrobnee'>
</div>
</div>
<hr />
<input type='button' value='Go' onclick='Go()' />
</body>
</html>