function checkExam(value){
	
	var form = document.examRegistrationForm;	
	
	form.mt_series.style.display="block";	
	form.mt_series.disabled=true;	
	form.e_series.style.display="none";		
	form.er_series.style.display="none";	
		
	<!-- show M/T Series -->
	if ("CERT-JNCIP-M" == value || "CERT-JNCIE-M" == value){ 
		//alert("mt-series");
		<!-- show mt_series -->
		form.mt_series.style.display="block";	
		form.mt_series.disabled=false;		
		
		<!-- hide -->
		form.e_series.style.display="none";		
		form.er_series.style.display="none";		
	}
	
	
	<!-- show E-series -->
	else if ("CERT-JNCIP-E" == value){
		<!-- show e_series -->
		//alert("e-series");

		form.e_series.style.display="block";	
		form.e_series.disabled=false;

		<!-- hide -->
		form.mt_series.style.display="none";	
		form.er_series.style.display="none";				
	}
	
	<!-- show ER-series -->
	else if ("CERT-JNCIE-ER" == value){
		<!-- show e_series -->
		//alert("er-series");

		form.er_series.style.display="block";	
		form.er_series.disabled=false;

		<!-- hide -->
		form.mt_series.style.display="none";	
		form.e_series.style.display="none";				
	}
	
	<!-- nothing selected -->
	else {
		form.mt_series.style.display="block";	
		form.mt_series.disabled=true;	
		form.e_series.style.display="none";		
		form.er_series.style.display="none";	
	}
}