function enviaform(){
	if (document.getElementById("palabras").value =="") {
	  alert("Por favor Indrotuzca la palabra de búsqueda")
      document.getElementById("palabras").focus();
      document.getElementById("palabras").select();
      return false;
	}else if (ValidarDatos(document.getElementById("palabras").value)==true){ 
		 document.forms[0].target="_parent";
		 document.forms[0].method="post";
		 document.forms[0].action="resultados.asp";
		 document.forms[0].submit();
	}else {
   	  alert("La palabra de busqueda contiene palabras y/o caracteres no permitidos")
      document.getElementById("palabras").focus();
      document.getElementById("palabras").select();
      return false;
   }
}

function ValidarDatos(campo) {
    var cadena=campo.toUpperCase();
	var cadenasprohibidas = new Array("CONTENT-TYPE:","MIME-VERSION:","CONTENT-TRANSFER-ENCODING:","RETURN-PATH:","SUBJECT:","FROM:","ENVELOPE-TO:","TO:","BCC:","CC:","PROCEDURE","PARAMETERS","DISTINCTROW","WITH","OWNERACCESS","OPTION","CONSTRAINT","TABLE","TRANSFORM","INNER","INTO","BETWEEN","HAVING","ORDER BY","FROM","WHERE","GROUP BY","CREATE","DROP","ALTER","UNION","SELECT","INSERT","UPDATE","DELETE"," AND "," OR ", " NOT ","WWW","W W W",". c o m","http://","'","^","$","--","%","#","*","@","/","\\",";","(",")",".",":","<",">","=","|","{","}","[","]","&","-",",","XP_","SYS_","OUTFILE","INFILE","SHUTDOWN","EXECUTE","SCRIPT","JAVASCRIPT:","ALERT","EVAL","STYLE","FRAME","IFRAME","OBJECT","ONABORT","ONBLUR","ONCHANGE","ONCLICK","ONDBLCLICK","ONDRAGDROP","ONERROR","ONFOCUS","ONKEYDOWN","ONKEYPRESS","ONKEYUP","ONLOAD","ONMOUSEDOWN","ONMOUSEMOVE","ONMOUSEOUT","ONMOUSEOVER","ONMOUSEUP","ONMOVER","ONRESET","ONRESIZE","ONSELECT","ONSUBMIT","ONUNLOAD","DOCUMENT") 
    for (i=0;i<cadenasprohibidas.length;i++){ 
       posi=cadena.indexOf(cadenasprohibidas[i], 0)+1
	   if (posi > 0) return false;
	}
  return true;
}