function createRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}

var http = createRequestObject();

function si2c(pesquisar) {

    http.open('get', 'gateway.php?action=si2c&pesquisar='+pesquisar);
	document.getElementById("resultados").innerHTML="<p>aguarde/wait...</p>";
    http.onreadystatechange = function() {
		if(http.readyState == 4){
				var response = http.responseText;
				if (response.length > 0) {
					document.getElementById("resultados").innerHTML=response;
				} else {
					document.getElementById("resultados").innerHTML="";
				}
		}		
	}
    http.send(null);
}

function si2c_letter(pesquisar) {

    http.open('get', 'gateway.php?action=si2c_letter&pesquisar='+pesquisar);
	document.getElementById("resultados").innerHTML="<p>aguarde/wait...</p>";
    http.onreadystatechange = function() {
		if(http.readyState == 4){
				var response = http.responseText;
				if (response.length > 0) {
					document.getElementById("resultados").innerHTML=response;
				} else {
					document.getElementById("resultados").innerHTML="";
				}
		}		
	}
    http.send(null);
}