Disabling and enabling a html input button

Using Javascript

• Disabling a html buttondocument.getElementById("Button").disabled = true;
• Enabling a html buttondocument.getElementById("Button").disabled = false;
• Demo Here

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Using jQuery

All versions of jQuery prior to 1.6

• Disabling a html button$('#Button').attr('disabled','disabled');
• Enabling a html button$('#Button').removeAttr('disabled');
• Demo Here

All versions of jQuery after 1.6

• Disabling a html button$('#Button').prop('disabled', true);
• Enabling a html button$('#Button').prop('disabled', false);
• Demo Here

P.S. Updated the code based on jquery 1.6.1 changes. As a suggestion, always use the latest jquery files and the prop() method.