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 E-mail Address (ie. user@domain.com)");
		   return false;
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail Address (ie. user@domain.com)");
		   return false;
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail Address (ie. user@domain.com)");
		    return false;
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail Address (ie. user@domain.com)");
		    return false;
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail Address (ie. user@domain.com)");
		    return false;
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail Address (ie. user@domain.com)");
		    return false;
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail Address (ie. user@domain.com)");
		    return false;
		 }

 		 return true;					
	}



function checkfields()
{
    if ( document.contact.name.value == "") 
    {
        alert('Please enter your full name.');
        return false;
    }

	//check email address
	if (echeck(document.contact.email.value)==false){
		document.contact.email.value="";
		document.contact.email.focus();
		return false;
	}

	    if ( document.contact.comments.value == "") 
    {
        alert("Comments are also required.");
        return false;
    }	
}