function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v3.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function VersionBrowser(Netscape, Explorer) 
{  
        if ((navigator.appVersion.substring(0,3) >= Netscape && navigator.appName == 'Netscape') || 
            (navigator.appVersion.substring(0,3) >= Explorer && navigator.appName.substring(0,9) == 'Microsoft'
))      
        {          
                return true;
        }            
        else 
        {
                return false;
        }
}


function countLetters()
{
        var query = document.frm.query.value;

        if (query.length<2)
        {
                // Likely to be no words at all
                return(false);
        }
        else
        {
                return(true);
        }
}

function checkForm() 
{ 	
        x=countWords();
        y=countLetters();
	
	
        if (VersionBrowser(3.0,4.0))
        {
                if (y==true)
                {
                        if(x==true)
                        {
                                //return(true);
                                document.frm.submit();
                        }
                        else if (x==false)
                        {
                                msg = "Para obtener mejores resultados se recomienda\n"+    
                                "describir su búsqueda usando una frase\n"+
                                "Presione Aceptar para continuar,\n o presione Cancelar para introducir más texto\n"; 
                                //return z;
                                if (confirm(msg)){document.frm.submit()};
                                
                                
                        }
                }
                else
                {
                        msg = "Se debe introducir al menos dos cárateres de texto en la consulta\n";
                        alert(msg);
                       // return(false); 
                }
        }
        else
        {
                //return(true);
                document.frm.submit();
                 
        }
}       

function countWords()
{
        var query = document.frm.query.value;
        
        var found=0;
        var i;

        for (i=0; i<query.length;i++)
        {
                x=query.charAt(i);
                if (x==" ")
                {
                        found++; 
                }
        }
        if (found<1)
        {
                return false;
        }
        else
        {
                return true;
        }
}

function validar1(){
  if (document.frm.elija[1].checked==true){
    document.frm.db1.value="docs_externos";
  }else {
    document.frm.db1.value="";
  }
  
}

function validar2(){
  document.frm.db0.value=document.frm.seccion.options[document.frm.seccion.selectedIndex].value;
  
}

function limpiar(){
    document.frm.query.value="";
}

function new_url(cadena){
	//newcadena=cadena.replace('url=ttp','url=http');
	return cadena;
}