function vacio(cadena)  
	  {                                     
		var blanco = " \n\t" + String.fromCharCode(13);   
		var i;                      
		var es_vacio;            
		for(i = 0, es_vacio = true; (i < cadena.length) && es_vacio; i++)  
		  es_vacio = blanco.indexOf(cadena.charAt(i)) != - 1;  
		return(es_vacio);  
	  }  
	function validaSearch(form)  
	  {  
		if(vacio(form.search.value))  {
		  alert("Please enter a word!"); 
		return(false);  }else{
		return(true); 
	  }  
	  }
	  
	function checkName(name)	{
		if(name.value == "")
			name.value = "Nombre *";
	} 
	 
	function checkEmail(email)	{
		if(email.value == "")
			email.value = "Email *";
	} 
	  
	function checkPhone(phone)	{
		if(phone.value == "")
			phone.value = "Teléfono *";
	} 
	 
	function checkComments(comment)	{
		if(comment.value == "")
			comment.value = "Comentarios";
	}  
			 
	function checkCode(code)	{
		if(code.value == "")
			code.value = "Escribe el código *";
	} 
	
	function validaEmail(txt){
	
	//expresion regular
        var b=/^[^@\s]+@[^@\.\s]+(\.[^@\.\s]+)+$/
        
        //comentar la siguiente linea si no se desea que aparezca el alert()
        alert("Invalid " + (b.test(txt)?"":"email ") + "address.")
          
        //devuelve verdadero si validacion OK, y falso en caso contrario
        return b.test(txt)
	}
	
	function validateFrm(form) {    
		if((form.name.value == '') || (form.name.value == 'Nombre *') || (form.email.value == '') || (form.email.value == 'Email *') || (form.phone.value == '') || (form.phone.value == 'Teléfono *') || (form.tmptxt.value == '') || (form.tmptxt.value == 'Escribe el código *')){
			alert('Nombre, Correo electrónico, Teléfono y el Código son obligatorios.');  
			return false;
		  } else{
		  return true;}
	}
	
	function validateNewsletter(form){    
		if((form.name.value == '') || (form.name.value == 'Nombre *') || (form.email.value == '') || (form.email.value == 'Email *')){
			alert('Nombre y Correo electrónico son obligatorios.');  
			return false;
		  } else{
		  return true;}
	
	}
		
	function validateFriend(form){    
		MM_validateForm('nameFriend','','R'); 
		MM_validateForm('nameYou','','R'); 
		MM_validateForm('emailFriend','','RisEmail');
		MM_validateForm('emailYou','','RisEmail');
		return document.MM_returnValue
	}
	
	function MM_findObj(n, d) { //v4.01 
		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); 
		if(!x && d.getElementById) x=d.getElementById(n); return x; 
		} 

	function MM_validateForm() { //v4.0 
		var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments; 
		for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=MM_findObj(args[i]); 
		if (val) { nm=val.name; if ((val=val.value)!="") { 
		if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@'); 
		if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n'; 
		} else if (test!='R') { num = parseFloat(val); 
		if (isNaN(val)) errors+='- '+nm+' debe ser numerico.\n'; 
		if (test.indexOf('inRange') != -1) { p=test.indexOf(':'); 
		min=test.substring(8,p); max=test.substring(p+1); 
		if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n'; 
		} } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; } 
		} if (errors) alert('The following error(s) occurred:\n'+errors); 
		document.MM_returnValue = (errors == ''); 
		} 
		
	function validateFrmProducts(form){    
		MM_validateForm('name','','R'); 
		MM_validateForm('phone','','R'); 
		MM_validateForm('email','','RisEmail');
		MM_validateForm('code','','R');
		return document.MM_returnValue
	}
		 
	function validateSales(form){    
		MM_validateForm('firstname','','R'); 
		MM_validateForm('address1','','R'); 
		MM_validateForm('email','','RisEmail');
		MM_validateForm('phone','','R');
		return document.MM_returnValue
	}