function enviar_c(){
var J_err;
J_err=false;
var mess0;
var mess1;
mess1="";
mess0="\nPlease confirm your information:"+
      "\n_________________________________";
        if(document.frm_c.firstname.value.length == 0){
            J_err=true;
            mess1 +="\n- First Name";
        }    

        if(document.frm_c.lastname.value.length == 0){
            J_err=true;
            mess1 +="\n- Last Name";
        }
		
        if(document.frm_c.email.value.length == 0 || !mail(document.frm_c.email.value)){
			J_err=true;
            mess1 +="\n- Email";
		}			
        if(J_err==false){
	    document.frm_c.action="send_en.php";
	    document.frm_c.method="Post";
	    document.frm_c.submit();
		alert("Message sent successfully");
        }    
        else{
           alert(mess0+"\n "+mess1);
        }
}


function mail(texto){ 

    var mailres = true;             
    var cadena = "abcdefghijklmnñopqrstuvwxyzABCDEFGHIJKLMNÑOPQRSTUVWXYZ1234567890@._-"; 
     
    var arroba = texto.indexOf("@",0); 
    if ((texto.lastIndexOf("@")) != arroba) arroba = -1; 
     
    var punto = texto.lastIndexOf("."); 
                 
     for (var contador = 0 ; contador < texto.length ; contador++){ 
        if (cadena.indexOf(texto.substr(contador, 1),0) == -1){ 
            mailres = false; 
            break; 
     } 
    } 

    if ((arroba > 1) && (arroba + 1 < punto) && (punto + 1 < (texto.length)) && (mailres == true) && (texto.indexOf("..",0) == -1)) 
     mailres = true; 
    else 
     mailres = false; 
                 
    return mailres; 
}