function validation_chk()
	{
		var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
		
		if(document.request_call_back.purpose_for_call.value=='')
		{
			alert("Please enter purpose for call value here");
			document.request_call_back.purpose_for_call.focus();
			return false;
		}
		else
		if(document.request_call_back.name.value=='')
		{
			alert("Please enter your name  here");
			document.request_call_back.name.focus();
			return false;
		}
		else
		if(document.request_call_back.company_name.value=='')
		{
			alert("Please enter your company name  here");
			document.request_call_back.company_name.focus();
			return false;
		}
		else
		if(document.request_call_back.email.value=='')
		{
			alert("Please enter your email address here");
			document.request_call_back.email.focus();
			return false;
		}
		if(reg.test(document.request_call_back.email.value) == false)
		{
			alert(" Please Enter a Valid Email ! ");
			document.request_call_back.email.focus();
			return false;
		}
		else
		if(document.request_call_back.phone_no.value=='')
		{
			alert("Please enter your phone number here");
			document.request_call_back.phone_no.focus();
			return false;
		}
		else
		if (isNaN(document.request_call_back.phone_no.value))
	    {
		   alert("The phone number contains only numerics values.");
		   document.request_call_back.phone_no.focus();
		   return false;
		}
		return true;
	}