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<script type="text/javascript">
$(function(){ //Disable the textbox var textbox = $('#syyproDurationMin'); textbox.attr("disabled","disabled"); $('#syyproReservation1').change(function(){ //Enable input if(textbox.attr('disabled')){ $('#syyproDurationMin').removeAttr('disabled'); $('#syyproDurationMin').val("60"); }else { textbox.attr("disabled","disabled"); } }); }); </script>