function EmailValidation(email)
 {
    //var regPattern = new RegExp("^[a-zA-Z][\w\.-]*[a-zA-Z0-9]*@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$");
    var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;  
    
   
    var strEmail = email;
    emailPattern.test(strEmail); 
   
    if(emailPattern.test(strEmail))
     {
        
     }
    else
      {
         alert("Please enter valid email address");
      } 
 }