function isEmail(elm){
	if (elm.value.indexOf("@") + "" != "-1" && elm.value.indexOf(".") + "" != "-1" && elm.value != "") return true;
	else return false;
}

function isReady(form,name,email,message,d_f,d_t) {
	if(isEmail(form.elements[email])==false) {
		alert("Email: yourname@yourdomainname.com");
		form.elements[email].focus();
		return false;
	}
	if (form.elements[name].value==""){
		alert("Please, enter your name");
		form.elements[name].focus();
		return false;
	}
	if (form.elements[message].value==""){
		alert("Please, enter your requirements");
		form.elements[message].focus();
		return false;
	}
		
	document.getElementById(d_f).style.display="none";
	document.getElementById(d_t).style.display="block";
	
	return true;
}