function validateLogin()
	  {
	  if(document.loginForm.Name.value=='')
		{		
		alert('Por favor escriba su Nombre...');
        return false;
		}
		else if(document.loginForm.apellidos.value=='')
		{		
		alert('Por favor escriba sus Apellidos...');
        return false;
		}
		else if(document.loginForm.cedula.value=='')
		{		
		alert('Por favor escriba su Cédula de Ciudadanía...');
        return false;
		}
		else if(document.loginForm.profesion.value=='')
		{		
		alert('Por favor escriba su Profesión u Ocupación...');
        return false;
		}
		else if(document.loginForm.addressresi.value=='')
		{		
		alert('Por favor escriba la Dirección de su Residencia...');
        return false;
		}
		else if(document.loginForm.phoneresi.value=='')
		{		
		alert('Por favor escriba el teléfono de su residencia...');
        return false;
		}
		else if(document.loginForm.addresscome.value=='')
		{		
		alert('Por favor escriba su Dirección Comercial...');
        return false;
		}
		else if(document.loginForm.phonecome.value=='')
		{		
		alert('Por favor escriba su Teléfono Comercial...');
        return false;
		}
		else if(document.loginForm.celular.value=='')
		{		
		alert('Por favor escriba el número de su Celular...');
        return false;
		}
		else if(document.loginForm.beeper.value=='')
		{		
		alert('Por favor escriba el número de su Beeper...');
        return false;
		}
		else if(document.loginForm.addresscorr.value=='')
		{		
		alert('Por favor escriba su Dirección de Correo...');
        return false;
		}
		else if(document.loginForm.apartado.value=='')
		{		
		alert('Por favor escriba su Apartado Aereo...');
        return false;
		}
		
		else if(document.loginForm.email.value=='')
		{		
		alert('Por favor escriba su e-mail...');
        return false;
		}
	  	else if(document.loginForm.Comments.value=='')
	    {
		alert('Por favor escriba su comentario...');
        return false;
		}					
		
		var emailStr = document.loginForm.email.value;
		var checkTLD=1;

/* The following is the list of known TLDs that an e-mail address must end with. */

var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

/* The following pattern is used to check if the entered e-mail address
fits the user@domain format.  It also is used to separate the username
from the domain. */

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

/* The following string represents the pattern for matching all special
characters.  We don't want to allow special characters in the address. 
These characters include ( ) < > @ , ; : \ " . [ ] */

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

/* The following string represents the range of characters allowed in a 
username or domainname.  It really states which chars aren't allowed.*/

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

/* The following pattern applies if the "user" is a quoted string (in
which case, there are no rules about which characters are allowed
and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
is a legal e-mail address. */

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

/* The following pattern applies for domains that are IP addresses,
rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
e-mail address. NOTE: The square brackets are required. */

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

/* The following string represents an atom (basically a series of non-special characters.) */

var atom=validChars + '+';

/* The following string represents one word in the typical username.
For example, in john.doe@somewhere.com, john and doe are words.
Basically, a word is either an atom or quoted string. */

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

// The following pattern describes the structure of the user

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

/* The following pattern describes the structure of a normal symbolic
domain, as opposed to ipDomainPat, shown above. */

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

/* Finally, let's start trying to figure out if the supplied address is valid. */

/* Begin with the coarse pattern to simply break up user@domain into
different pieces that are easy to analyze. */

var matchArray=emailStr.match(emailPat);

if (matchArray==null) {

/* Too many/few @'s or something; basically, this address doesn't
even fit the general mould of a valid e-mail address. */

alert("El Email es incorrecto, (verifique @ y .)");
return false;
}
var user=matchArray[1];
var domain=matchArray[2];

// Start by checking that only basic ASCII characters are in the strings (0-127).

for (i=0; i<user.length; i++) {
if (user.charCodeAt(i)>127) {
alert("El nombre de usuario contiene caracteres invalidos.");
return false;
   }
}
for (i=0; i<domain.length; i++) {
if (domain.charCodeAt(i)>127) {
alert("El nombre de dominio contiene caracteres invalidos.");
return false;
   }
}

// See if "user" is valid 

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

// user is not valid

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

/* if the e-mail address is at an IP address (as opposed to a symbolic
host name) make sure the IP address is valid. */

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

// this is an IP address

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

// Domain is symbolic name.  Check if it's valid.
 
var atomPat=new RegExp("^" + atom + "$");
var domArr=domain.split(".");
var len=domArr.length;
for (i=0;i<len;i++) {
if (domArr[i].search(atomPat)==-1) {
alert("El nombre de dominio no se valido.");
return false;
   }
}

/* domain name seems valid, but now make sure that it ends in a
known top-level domain (like com, edu, gov) or a two-letter word,
representing country (uk, nl), and that there's a hostname preceding 
the domain or country. */

if (checkTLD && domArr[domArr.length-1].length!=2 && 
domArr[domArr.length-1].search(knownDomsPat)==-1) {
alert("El email debe tener un nombre de dominio existente.");
return false;
}

// Make sure there's a host name preceding the domain.

if (len<2) {
alert("El Email no tiene un HostName!");
return false;
}
		
		
		return true;
}