what.form.<% $opt{'prefix'} %>exchange.disabled = 'disabled';
what.form.<% $opt{'prefix'} %>exchange.style.display = 'none';
var exchangewait = document.getElementById('<% $opt{'prefix'} %>exchangewait');
what.form.<% $opt{'prefix'} %>exchange.disabled = 'disabled';
what.form.<% $opt{'prefix'} %>exchange.style.display = 'none';
var exchangewait = document.getElementById('<% $opt{'prefix'} %>exchangewait');