//check numeric value
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;
}

///check values
function checkvalidation()
{
//alert("form file");
var Names=document.f1.Names.value
var Email=document.f1.Email.value
var Phone=document.f1.Phone.value
var Address=document.f1.Address.value
var Comments=document.f1.Comments.value

var reg = new RegExp("^[A-Za-z0-9_]{1,}[.]?[A-Za-z0-9_]{1,}@{1}([A-Za-z0-9_]+[.]{1})+[A-Za-z0-9_]{1,}$");

if(Names=="")
{
alert("Please Enter Name.");
document.f1.Names.focus();
return false;
}
if(Email=="")
{
alert("Please Enter Email ID.");
document.f1.Email.focus();
return false;
}
else if(!reg.test(Email)) 
{
alert("Invalid Email Id. Please Enter Your Email Id.");
document.f1.Email.focus();
return false;
}
if(Phone=="")
{
alert("Please Enter Phone.");
document.f1.Phone.focus();
return false;
}
else if(IsNumeric(Phone)==false)
	{
	 alert("Please Enter The Numeric values.");
	 document.f1.Phone.focus();
	 return false;
	 }

if(Address=="")
{
alert("Please Enter Address.");
document.f1.Address.focus();
return false;
}

if(Comments=="")
{
alert("Please Enter Comments.");
document.f1.Comments.focus();
return false;
}


}