function validarDatos(){
	var alerts = "";
	if(document.demoform.nombre.value==""){
		alerts = "Name.";
		document.demoform.nombre.focus();
	}else if(document.demoform.pais.selectedIndex==0){
		alerts = "Select your country.";
		document.demoform.pais.focus();
	}else if(document.demoform.email.value==""){
		alerts = "E-mail.";		
		document.demoform.email.focus();
	}else if(document.demoform.dc1.value==""){
		alerts = "Select your Entrance date.";
	}else if(document.demoform.dc2.value==""){
		alerts = "Select your leave date.";
	}else{
		document.demoform.submit();
	}
	if(alerts==""){
		document.demoform.submit();
	}else{
		alert(alerts);
	}
}