<script>
var click;
function fnClick(){
     alert('tt')
}
function test()
{
     alert("test");
}

function fnLoad()
{
     tt.onclick = click;
}

function fnSave()
{
     click = tt.onclick;
     tt.onclick = null;
     tt1.disabled = false;
}
</script>
<input type='button' >
<input type='button' onclick='fnLoad()' disabled>
<input type='button' onclick='fnSave()'>

 

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