Add two functions to window.onload

by 
window.addEventListener("load",function(event) {
    var $input2 = document.getElementById('dec');
    var $input1 = document.getElementById('parenta');
    $input1.addEventListener('keyup', function() {
        $input2.value = $input1.value;
    });
},false);

window.addEventListener("load",function(){
    document.getElementById('enable').onchange=function(){
        var txt = document.getElementById('gov1');
        if(this.checked) txt.disabled=false;
        else txt.disabled = true;
    };
},false);

Documentation is here

Note that this solution may not work across browsers. I think you need to rely on a 3-rd library, like jquery $(document).ready

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