// JavaScript Document

function isValidEmail(str)

{

   return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);

}

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function validations()
{
name = document.getElementById("name").value;	
mail=document.getElementById("email").value;
phone = document.getElementById("phone").value;
age= document.getElementById("age").value;
 
if(name==""){ alert ("Please Enter Your Name"); return false; }
if(mail=="") { alert ("Please Enter Your Email id"); return false;}
if (!isValidEmail(mail)){ alert("Invalid E-mail Address! Please re-enter."); return false; }
if(phone=="") { alert ("Please Enter Valid  Phone No."); return false;}
if(!isInteger(phone)){ alert ("Please Enter Valid Phone No.! Please re-enter."); return false; }
if(age==""){ alert ("Please Enter Your Age"); return false; }
}