<script>
function checkb(flag){
var boxs=document.getElementsByName("jiage");
for(i=0;i<boxs.length;i++)
{
var val=boxs[i].value;
if(val==flag)
{
}else
{
boxs[i].checked=false;
}
}
}
</script>
<html>
<head>
<head>
<body>
<input type="checkbox" id="bianzhijia" name="jiage" value="bianzhijia" οnclick="checkb('bianzhijia')">
<input type="checkbox" id="sonshenjia" name="jiage" value="sonshenjia" οnclick="checkb('sonshenjia')">
<input type="checkbox" id="shendinjia" name="jiage" value="shendinjia" οnclick="checkb('shendinjia')">
<input type="checkbox" id="hejianjia" name="jiage" value="hejianjia" οnclick="checkb('hejianjia')">
</body>
</html>