function checkForm() {
	
    if (document.Contact_Form.Name.value == "") {
       alert("You have not entered a name.");
	   document.Contact_Form.Name.focus();
	   return false;
	}
	if (document.Contact_Form.Email.value == "") {
       alert("You have not entered an email address.");
	   document.Contact_Form.Email.focus();
	   return false;
	}
	if (echeck(document.Contact_Form.Email.value) == false){
		document.Contact_Form.Email.focus();
		return false
	}
	if (document.Contact_Form.Comments.value == "") {
       alert("You have not entered any comments.");
	   document.Contact_Form.Comments.focus();
	   return false;
	}
	return true;
}

function echeck(str) {

	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
	   alert("Invalid contact e-mail address")
	   return false
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		alert("Invalid Email")
	   return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		alert("Invalid Email")
		return false
	}

	 if (str.indexOf(at,(lat+1))!=-1){
		alert("Invalid Email")
		return false
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		alert("Invalid Email")
		return false
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
		alert("Invalid Email")
		return false
	 }
	
	 if (str.indexOf(" ")!=-1){
		alert("Invalid Email")
		return false
	 }

	 return true					
}