// JavaScript Document

function comprueba ( form ) 
{ 
  // ** START ** 
  if (form.consulta.value == "") { 
    alert( "Debe ingresar al menos una palabra para buscar." ); 
    form.consulta.focus(); 
    return false ; 
  } 
  // ** END ** 
  return true ; 
} 

<!-- 

        //maneja los eventos en el campo de texto desabilitando la tecla ENTER
				
		function DesabilitarEnter (field, event) {
				var keyCode = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
				if (keyCode == 13) {
			var i;
			for (i = 0; i < field.form.elements.length; i++)
				if (field == field.form.elements[i])
					break;
			i = (i + 1) % field.form.elements.length;
			field.form.elements[i].focus();
			return false;
		} 
		else
		return true;
	}      


function comprobarEmail (emailStr) {

var emailPat=/^(.+)@(.+)$/

var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"

var validChars="\[^\\s" + specialChars + "\]"

var quotedUser="(\"[^\"]*\")"

var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/

var atom=validChars + '+'

var word="(" + atom + "|" + quotedUser + ")"

var userPat=new RegExp("^" + word + "(\\." + word + ")*$")

var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")

var matchArray=emailStr.match(emailPat)
if (matchArray==null) {

	alert("La dirección de email es invalida, por favor correjir")
	return false
}
var user=matchArray[1]
var domain=matchArray[2]


if (user.match(userPat)==null) {

    alert("El usuario no es valido.")
    return false
}

var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {

	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
	        alert("La ip es invalida!")
		return false
	    }
    }
    return true
}


var domainArray=domain.match(domainPat)
if (domainArray==null) {
	alert("El dominio es invalido.")
    return false
}


var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {

   alert("El dominio debe terminar con 2 o 3 caracteres.")
   return false
}


if (len<2) {
   var errStr="Falta un host!"
   alert(errStr)
   return false
}


return true;
}

//--> 

<!--
var VentEmerg6=0;
function RadioOnLine(URLStr, left, top, width, height)
{
  if(VentEmerg6)
  {
    if(!VentEmerg6.closed) VentEmerg6.close();
  }
  VentEmerg6 = open(URLStr, 'R', 'toolbar=no,location=no,directories=no,status=no,menub ar=no,scrollbar=no,resizable=no,copyhistory=no,width=290,height=210,left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
}
//-->

<!-- funcion esquinas redondeadas

function EsquinasRedondas() { 
 var divs = document.getElementsByTagName('div'); 
 var rounded_divs = []; 
 /* busco div con el atributo 'rounded' en la clase  /*
 for (var i = 0; i < divs.length; i++) { 
   if (/\brounded\b/.exec(divs[i].className)) { 
     rounded_divs[rounded_divs.length] = divs[i]; 
   } 
 } 
 /* agrega divs adicionales a los encontrados */ 
 for (var i = 0; i < rounded_divs.length; i++) { 
   var original = rounded_divs[i]; 
   /* Make it the inner div of the four */ 
   original.className = original.className.replace('rounded', ''); 
   /* Now create the outer-most div */ 
   var tr = document.createElement('div'); 
   tr.className = 'rounded2'; 
   /* Swap out the original (we'll put it back later) */ 
   original.parentNode.replaceChild(tr, original); 
   /* Create the two other inner nodes */ 
   var tl = document.createElement('div'); 
   var br = document.createElement('div'); 
   /* Now glue the nodes back in to the document */ 
   tr.appendChild(tl); 
   tl.appendChild(br); 
   br.appendChild(original); 
 } 
} 

//window.onload = EsquinasRedondas;


//-->