function chk_string( str, req, min, max )// Checking the lent of the text box

{

	if( str.length == 0 && !req )

		return 0;

	if( str.length < min || str.length > max )

		return 1;

	return 0;

}





function chk_email( str, req )

{

	var email_RegEx = /^\w+([-.]\w+)*\@\w+([-.]\w+)*\.\w+$/;

	if( str.length == 0 && !req )

	    return 0;

	var found = email_RegEx.test( str );

	if( found == false )

	    return 1;

	return 0;

}

function datavalidation()

{	

		
		if( chk_string( document.form.companyname.value, 1, 2, 200 ) )

	{

		alert("Company Name is not specified");

		document.form.companyname.focus();

		return false;

	}	



	if( chk_string( document.form.name.value, 1, 2, 200 ) )

	{

		alert("Name is not specified");

		document.form.name.focus();

		return false;

	}	
	
	if( chk_string( document.form.telephoneno.value, 1, 2, 15 ) )

	{

		alert("Telephone No. is not specified");

		document.form.telephoneno.focus();

		return false;

	}	
	

	

	 if( chk_email( document.form.emailid.value, 1, 2, 200 ) )

	{

		alert("Email address invalid or not specified");

		document.form.emailid.focus();

		return false;

	} 

	





	if( chk_string( document.form.subject.value, 1, 2, 200 ) )

	{

		alert("Subject is not specified");

		document.form.subject.focus();

		return false;

	}	

	

	

	if( chk_string( document.form.message.value, 1, 2, 2000 ) )

	{

		alert("Message is not specified");

		document.form.message.focus();

		return false;

	}	





}