function checksurvey()
{
	var l = survey.surveyanswer;
	var flag = true;
	if(isNaN(survey.surveyanswer.length))
	{
		if(survey.surveyanswer.checked)
		{
			flag = false;
		}
	}
	else
	{
		for(var i=0;i<survey.surveyanswer.length;i++)
		{
			if(l[i].checked)
			{
				flag = false;
			}
		}
	}
	
	if (flag)
	{
		alert("Please select one option before you submit the survey");
		return false;
	}
}