function validateEmail(form1){      
       var emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
       return emailPattern.test(form1); 
   }
   function chkform(form1)
   {
	    if(document.form1.name.value=="" || document.form1.name.value=="Name:")
    {
     alert("please enter your name");
     document.form1.name.focus();
     return false;
    }
	    if(document.form1.phone.value=="" || document.form1.phone.value=="Telephone:")
    {
     alert("please enter your Telephone No");
     document.form1.phone.focus();
     return false;
    }
    if(document.form1.email.value=="" || document.form1.email.value=="E mail:")
    {
     alert("please enter email address");
     document.form1.email.focus();
     return false;
    }
    if(!validateEmail(document.form1.email.value))
    {
     alert("please enter correct email address");
     document.form1.email.focus();
     return false;
    }
  if(document.form1.message.value=="" || document.form1.message.value=="Message:")
    {
     alert("please enter comments");
     document.form1.message.focus();
     return false;
    }
    return true;
   }