function changeContractParams()
{
	if (document.getElementById("req_service1").checked == true)
		document.getElementById("req_service1_div").style.display="block";
	else
		document.getElementById("req_service1_div").style.display="none";
	
	if (document.getElementById("req_service2").checked == true)
		document.getElementById("req_service2_div").style.display="block";
	else
		document.getElementById("req_service2_div").style.display="none";
	
	if (document.getElementById("req_source1").checked == true)
		document.getElementById("req_source1_div").style.display="block";
	else
		document.getElementById("req_source1_div").style.display="none";
	
	if (document.getElementById("req_source6").checked == true)
		document.getElementById("req_source6_div").style.display="block";
	else
		document.getElementById("req_source6_div").style.display="none";	
	
	if (document.getElementById("req_source7").checked == true)
		document.getElementById("req_source7_div").style.display="block";
	else
		document.getElementById("req_source7_div").style.display="none";	
	
}