/*
CSS Browser Selector v0.3.1
Rafael Lima (http://rafael.adm.br)
http://rafael.adm.br/css_browser_selector
License: http://creativecommons.org/licenses/by/2.5/
Contributors: http://rafael.adm.br/css_browser_selector#contributors
*/
function css_browser_selector(u){var ua = u.toLowerCase(),is=function(t){return ua.indexOf(t)>-1;},g='gecko',w='webkit',s='safari',h=document.getElementsByTagName('html')[0],b=[(!(/opera|webtv/i.test(ua))&&/msie\s(\d)/.test(ua))?('ie ie'+RegExp.$1):is('firefox/2')?g+' ff2':is('firefox/3')?g+' ff3':is('gecko/')?g:/opera(\s|\/)(\d+)/.test(ua)?'opera opera'+RegExp.$2:is('konqueror')?'konqueror':is('chrome')?w+' '+s+' chrome':is('applewebkit/')?w+' '+s+(/version\/(\d+)/.test(ua)?' '+s+RegExp.$1:''):is('mozilla/')?g:'',is('j2me')?'mobile':is('iphone')?'iphone':is('ipod')?'ipod':is('mac')?'mac':is('darwin')?'mac':is('webtv')?'webtv':is('win')?'win':is('freebsd')?'freebsd':(is('x11')||is('linux'))?'linux':'','js']; c = b.join(' '); h.className += ' '+c; return c;}; css_browser_selector(navigator.userAgent);

// esta função abre um canal para as chamadas Ajax //
function getRequestXml(){
    if(window.XMLHttpRequest) { // Mozilla, Safari,...
        return new XMLHttpRequest();
        
        if (http_request.overrideMimeType) http_request.overrideMimeType('text/xml');
        
    }else if (window.ActiveXObject) { // IE
        try{
            return new ActiveXObject("Msxml2.XMLHTTP");
        }catch (e){
            try{
                return new ActiveXObject("Microsoft.XMLHTTP");
            }catch(e){
            }
        }
    }

    if (!http_request) {
        alert('Sem suporte há esta funcionalidade');
        return false;
    }
}

function verificaCampo(campo,valor,comparacao){
    if(valor==comparacao){
        document.getElementById(campo).value="";
    }else if(Trim(valor)==""){
        document.getElementById(campo).value=comparacao;
    }
}