Estudar esse link

http://translate.google.com.br/translate?hl=pt-BR&sl=en&u=http://www.justdreamweaver.com/dreamweaver-jquery.html&ei=cmMESoSHKsfAtwe71eGGBw&sa=X&oi=translate&resnum=2&ct=result&prev=/search%3Fq%3Djquery%2Bdreamweaver%2Bcs4%26hl%3Dpt-BR%26sa%3DX

Attributos

$(document).ready(function(){
$('#botao1').click(adicionar);
$('#botao2').click(recupear);
$('#botao3').click(eliminar);
})
function adicionar(){ $('#tabela1').attr("border","1");}
function recuperar(){
if($('#tabela1').attr("border")!=0{
var x =$('#tabela1').attr("border");
alert x;
}else{
alert("tabela sem borda")
}
)
}
function eliminar()}{$('#tabela1').removeattr("border","1");}

Jquer - Html

$(document).ready(function(){
$('#botao1').click(mostrarformulario);
$('#botao2').click(mostrarelemento);
})

function mostrarformulario(){
$('#formulario').html('-form>-input type="text">-/form>')
}
function mostrarelemento(){
var x=$('#formulario').html('');
alert(x)
}