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")
		   return false
		}

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

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

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

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

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

 		 return true					
}
function formValidator(f)
{
      if(f.name.value=="")
        {
          alert('Please enter your name');
          f.name.focus();
          return false;
        }
		if ((f.email.value==null)||(f.email.value==""))
        {
          alert('Please enter an e-mail address');
          f.email.focus();
		  return false;
         }     
		if (echeck(f.email.value)==false)
		{
		f.email.focus()
		return false
		}
        if(f.comment.value=="")
        {
          alert('Please complete the comments box');
          f.comment.focus();
          return false;
        }
	return true;
}