function chkdata(f)
{
	var result=false;	
	var dob_regex = /^([0-9]){2}(\/){1}([0-9]){2}(\/)([0-9]){4}$/;   // DD/MM/YYYY
	var num_regex = /^\d+$/; // numeric digits only
	var search_regex = "/hello/";
	var phone_regex = /^\(\d{3]\) \d{3}-\d{4}$/;  // (xxx) xxx-xxxx
	var question_regex = /\?$/; // ends with a question mark
	var na=document.getElementById("name").value;
	var ph=document.getElementById("phone").value;
	var em=document.getElementById("email").value;
	var ev=document.getElementById("event").value;
	var da=document.getElementById("message").value;
	if(na=='')
	{
		alert("Please enter your Name.");
		document.getElementById("name").focus();
		return false;
	}
	
		var num_regex = /^\d+$/; // numeric digits only
		if(ph=="")
		{
			alert("Please enter Phone.");
			document.getElementById("phone").focus();
			return false;
		}
		else if(!num_regex.test(ph))
		{
			alert("Please enter numeric only.");
			document.getElementById("phone").focus();
			return false;
		}

	var email_regex = /^[a-zA-Z0-9._-]+@([a-zA-Z0-9.-]+\.)+[a-zA-Z0-9.-]{2,4}$/;
		if(em=="")
		{
			alert("Please enter your Email ID");
			document.getElementById("email").focus();
			return false;
		}
		else if(!email_regex.test(em))
		{
			alert("Please enter a valid Email ID");
			document.getElementById("email").focus();
			return false;
		}
	/*if(ev=='')
	{
		alert("Please enter event.");
		document.getElementById("event").focus();
		return false;
	}*/
	
	/*var dob_regex = /^([0-9]){2}(\/){1}([0-9]){2}(\/)([0-9]){4}$/;   // DD/MM/YYYY
	if(da=="")
	{
		alert("Please enter your Message");
		document.getElementById("message").focus();
		return false;
	}*/
	/*else if(!dob_regex.test(da))
	{
		alert("Please enter a valid date (DD/MM/YYYY) format");
		document.getElementById("date").focus();
		return false;
	}*/

}