function clearSingUp(){
	
		if($F("email_signup") == 'youremail@here.com' || $F("email_signup") == 'tuemail@aqui.com' )
			$("email_signup").value = ''	;
		
	}
	
	function singUp(email){
		
		if($F("email_signup") == 'youremail@here.com' || $F("email_signup") == 'tuemail@aqui.com' ){
			alert("Invalid email");	
			return;
		}
		 
		if (!/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email)){
			alert("Invalid email format");			
		}else{
			 x_doAjaxCall("POST", "signup.do.php", "email="+email, "doSignUp" ,"","", true,true );
		}

		 return;		
		
	}

	function doSignUp(responseText){

        var cadena = x_evalAjaxResponse(responseText);
			
        if (cadena['false']!=""){
            alert(cadena['false']);            
        }else if(cadena['true']!=""){
			alert(cadena['true']);    
			$("email_signup").value="";
		}

	
	}