if (document.images)
{   a = new Image(140, 20);
    a.src = urlImages + "Controles/PageHeader/btn_pessoa_juridica.gif";
    b = new Image(140, 20);
    b.src = urlImages + "Controles/PageHeader/btn_pessoa_fisica.gif"; 
}

p = 0;

function troca_pessoa(){
    if (p == 1) {
        window.parent.frm_top.location.href= urlContents +"home/topo_pj.aspx";
		document.images['pessoa'].src=b.src;
        p = 0;
    } else {
        window.parent.frm_top.location.href= urlContents + "home/topo.aspx";
		document.images['pessoa'].src=a.src;
        p = 1;
    }
}

function abrepop(){
    var pop= abreJanela(urlContents + 'popups/pop_bradescopp.aspx','oquee','width=680,height=318');
}