var http_request=false;function makeRequest(b,a){http_request=false;if(window.XMLHttpRequest){http_request=new XMLHttpRequest();if(http_request.overrideMimeType){http_request.overrideMimeType("text/html")}}else{if(window.ActiveXObject){try{http_request=new ActiveXObject("Msxml2.XMLHTTP")}catch(c){try{http_request=new ActiveXObject("Microsoft.XMLHTTP")}catch(c){}}}}if(!http_request){alert("Falla :( No es posible crear una instancia XMLHTTP");return false}http_request.onreadystatechange=alertContents;http_request.open("GET",b,true);http_request.send(null)}function alertContents(){if(http_request.readyState==4){if(http_request.status==200){resultado=http_request.responseText;i=resultado.indexOf("<resultado>",0);f=resultado.indexOf("</resultado>",i);alert(resultado.substr((i+11),f-(i+11)))}else{alert("Hubo problemas con la petición.")}}};