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header{position:relative;}
header img,header h1{position:fixed;}
header,header img,header h1{width:100%;height:300px;z-index:2;border:none;}
header img{background:url(1.jpg)center;}
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function a() {document.getElementById('info1').style.display='block';}
function b() {document.getElementById('info2').style.display='block';}
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<input type="radio" name="1" onChange="c()">3
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<div id="info1" style="display:none">
<label><input name="2" type="radio" value="Да" />1Да</label>
<label><input name="2" type="radio" value="Нет" />1Нет</label>
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<label><input name="3" type="radio" value="Да" />2Да</label>
<label><input name="3" type="radio" value="Нет" />2Нет</label>
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<div id="info3" style="display:none">
<label><input name="4" type="radio" value="Да" />3Да</label>
<label><input name="4" type="radio" value="Нет" />3Нет</label>
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