function checkProperties(f){


var validchar = "abcdefghijklmnopqrstuvwxyz~!@#$%^&*()_+=-`{}|\][;':,./?><* ";
var Invalidchar = "abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ~!@#$%^&*()_+=-`{}|\][;':,./?><*";
var ValidEmail = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@-._";
var validnum = "0123456789";
var ValidNAME = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ";


if (f["name"].value == ""){
alert("Please enter your name.");
f["name"].focus();
return false;
}


if (f["address"].value == ""){
alert("Please enter your address.");
f["address"].focus();
return false;
}

if (f["phone"].value == ""){
alert("Please enter phone number. ");
f["phone"].focus();
return false;
}else {
if (!IsNumeric(f.phone.value)){
	alert('Please enter a valid phone number.');
	f.phone.focus();
	return false;
	}
}

if (f["email"].value == ""){
		alert("Please enter your email address.");
		f["email"].focus();
		return false;
}else {
if (!IsValidEmail(f.email.value)){
	alert('Please enter a valid email address.');
	f.email.focus();
	return false;
	}
}

//system Form end

return true;

}

function IsValidEmail(str){
  var filter=/^.+@.+\..{2,3}$/
  return (filter.test(str))
}

function IsNumeric(sText)

{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < sText.length && IsNumber == true; i++) 
      { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         IsNumber = false;
         }
      }
   return IsNumber;
   
   }