function s_chg(td_now)
{

	if(td_now.id == "tch_cctv_1_1")
	{
		tch_cctv_1_1.className="tch_cctv_1_current";
		tch_cctv_2_1.className="tch_cctv_2";
		tch_cctv_3_1.className="tch_cctv_3";
		tch_cctv_4_1.className="tch_cctv_4";
		tch_cctv_5_1.className="tch_cctv_5";
		tch_cctv_6_1.className="tch_cctv_6";
		tch_cctv_7_1.className="tch_cctv_7";
		shield1.style.display="none";
		shield2.style.display="block";
		shield3.style.display="block";
		shield4.style.display="block";
		shield5.style.display="block";
		shield6.style.display="block";
		shield7.style.display="block";
	}
	if(td_now.id == "tch_cctv_2_1")
	{
		tch_cctv_1_1.className="tch_cctv_1";
		tch_cctv_2_1.className="tch_cctv_2_current";
		tch_cctv_3_1.className="tch_cctv_3";
		tch_cctv_4_1.className="tch_cctv_4";
		tch_cctv_5_1.className="tch_cctv_5";
		tch_cctv_6_1.className="tch_cctv_6";
		tch_cctv_7_1.className="tch_cctv_7";
		shield1.style.display="block";
		shield2.style.display="none";
		shield3.style.display="block";
		shield4.style.display="block";
		shield5.style.display="block";
		shield6.style.display="block";
		shield7.style.display="block";
	}
	if(td_now.id == "tch_cctv_3_1")
	{
		tch_cctv_1_1.className="tch_cctv_1";
		tch_cctv_2_1.className="tch_cctv_2";
		tch_cctv_3_1.className="tch_cctv_3_current";
		tch_cctv_4_1.className="tch_cctv_4";
		tch_cctv_5_1.className="tch_cctv_5";
		tch_cctv_6_1.className="tch_cctv_6";
		tch_cctv_7_1.className="tch_cctv_7";
		shield1.style.display="block";
		shield2.style.display="block";
		shield3.style.display="none";
		shield4.style.display="block";
		shield5.style.display="block";
		shield6.style.display="block";
		shield7.style.display="block";
	}
	if(td_now.id == "tch_cctv_4_1")
	{
		tch_cctv_1_1.className="tch_cctv_1";
		tch_cctv_2_1.className="tch_cctv_2";
		tch_cctv_3_1.className="tch_cctv_3";
		tch_cctv_4_1.className="tch_cctv_4_current";
		tch_cctv_5_1.className="tch_cctv_5";
		tch_cctv_6_1.className="tch_cctv_6";
		tch_cctv_7_1.className="tch_cctv_7";
		shield1.style.display="block";
		shield2.style.display="block";
		shield3.style.display="block";
		shield4.style.display="none";
		shield5.style.display="block";
		shield6.style.display="block";
		shield7.style.display="block";
	}
	if(td_now.id == "tch_cctv_5_1")
	{
		tch_cctv_1_1.className="tch_cctv_1";
		tch_cctv_2_1.className="tch_cctv_2";
		tch_cctv_3_1.className="tch_cctv_3";
		tch_cctv_4_1.className="tch_cctv_4";
		tch_cctv_5_1.className="tch_cctv_5_current";
		tch_cctv_6_1.className="tch_cctv_6";
		tch_cctv_7_1.className="tch_cctv_7";
		shield1.style.display="block";
		shield2.style.display="block";
		shield3.style.display="block";
		shield4.style.display="block";
		shield5.style.display="none";
		shield6.style.display="block";
		shield7.style.display="block";
	}
	if(td_now.id == "tch_cctv_6_1")
	{
		tch_cctv_1_1.className="tch_cctv_1";
		tch_cctv_2_1.className="tch_cctv_2";
		tch_cctv_3_1.className="tch_cctv_3";
		tch_cctv_4_1.className="tch_cctv_4";
		tch_cctv_5_1.className="tch_cctv_5";
		tch_cctv_6_1.className="tch_cctv_6_current";
		tch_cctv_7_1.className="tch_cctv_7";
		shield1.style.display="block";
		shield2.style.display="block";
		shield3.style.display="block";
		shield4.style.display="block";
		shield5.style.display="block";
		shield6.style.display="none";
		shield7.style.display="block";
	}
	if(td_now.id == "tch_cctv_7_1")
	{
		tch_cctv_1_1.className="tch_cctv_1";
		tch_cctv_2_1.className="tch_cctv_2";
		tch_cctv_3_1.className="tch_cctv_3";
		tch_cctv_4_1.className="tch_cctv_4";
		tch_cctv_5_1.className="tch_cctv_5";
		tch_cctv_6_1.className="tch_cctv_6";
		tch_cctv_7_1.className="tch_cctv_7_current";
		shield1.style.display="block";
		shield2.style.display="block";
		shield3.style.display="block";
		shield4.style.display="block";
		shield5.style.display="block";
		shield6.style.display="block";
		shield7.style.display="none";
	}
	
	}