// fuction to remove all spaces in input field before checking
function removeSpaces(string) {
	var tstring = "";
	string = '' + string;
	splitstring = string.split(" ");
	for(i = 0; i < splitstring.length; i++)
	tstring += splitstring[i];
	return tstring;
}

function check_form() {

	// sendto
	if (removeSpaces(document.getElementById('sendto').value)=='')	{
		 alert("Please, choose Recipient");
		 document.getElementById('sendto').focus();
		 return false;
	};

	// firstname
	if (removeSpaces(document.getElementById('firstname').value)=='')	{
		 alert("Please, enter your First Name");
		 document.getElementById('firstname').focus();
		 return false;
	};

	// lastname
	if (removeSpaces(document.getElementById('lastname').value)=='')	{
		 alert("Please, enter your Last Name");
		 document.getElementById('lastname').focus();
		 return false;
	};

	// phonenumber
	if (removeSpaces(document.getElementById('phonenumber').value)=='')	{
		 alert("Please, enter your Phone Number");
		 document.getElementById('phonenumber').focus();
		 return false;
	};

	// email
	if (removeSpaces(document.getElementById('email').value)=='') {
		alert("Please, enter your Email");
		document.getElementById('email').focus();
		return false;
	};

	// check email
	if (!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(document.getElementById('email').value))) {
		alert("This Email isn't correct");
		document.getElementById('email').select();
		document.getElementById('email').focus();
		return false;
	};

	document.getElementById('contactus').submit();
}