$("#myID").html("<div>New inner html</div>"); //replace element innerHTML in jQuery
$(element).html("Hello World");
$('#selector').text('Your text here');
$("button").click(function(){ $("p").html("Hello <b>world</b>!"); });
var itemtoReplaceContentOf = $('#regTitle'); itemtoReplaceContentOf.html(''); newcontent.appendTo(itemtoReplaceContentOf);