window.onload = function() { changeInputs(); }

function changeInputs()
{
var els = document.getElementsByTagName('input');
var elsLen = els.length;
var i = 0;
for ( i=0;i<elsLen;i++ )
{
if ( els[i].getAttribute('type') )
{
if ( els[i].getAttribute('type') == "checkbox" )
els[i].className = 'checkbox';
else if ( els[i].getAttribute('type') == "submit" )
els[i].className = 'submit rounded';
else if ( els[i].getAttribute('type') == "SUBMIT" )
els[i].className = 'submit rounded';
}
}
}