ct1 = new Image(); 	ct1.src = "gfx/button_ct1.jpg"			
ct2 = new Image(); 	ct2.src = "gfx/button_ct2.jpg"			
ct3 = new Image(); 	ct3.src = "gfx/button_ct3.jpg"			
dp1 = new Image(); dp1.src = "gfx/button_dp1.jpg"			
dp2 = new Image(); dp2.src = "gfx/button_dp2.jpg"			
dp3 = new Image(); dp3.src = "gfx/button_dp3.jpg"			
soc1 = new Image(); soc1.src = "gfx/button_soc1.jpg"			
soc2 = new Image(); soc2.src = "gfx/button_soc2.jpg"			
soc3 = new Image(); soc3.src = "gfx/button_soc3.jpg"			
yac1 = new Image();	yac1.src = "gfx/button_yac1.jpg"			
yac2 = new Image(); 	yac2.src = "gfx/button_yac2.jpg"			
yac3 = new Image(); 	yac3.src = "gfx/button_yac3.jpg"			
bio1 = new Image(); bio1.src = "gfx/button_bio1.jpg"			
bio2 = new Image(); bio2.src = "gfx/button_bio2.jpg"			
bio3 = new Image(); bio3.src = "gfx/button_bio3.jpg"			

function ct_reset()			
	{			
	ct1.src = "gfx/button_ct1.jpg";			
	ct2.src = "gfx/button_ct2.jpg";			
	ct3.src = "gfx/button_ct3.jpg";			
	document.images['ct'].src = ct1.src;			
	}			

function dp_reset()			
	{			
	dp1.src = "gfx/button_dp1.jpg";			
	dp2.src = "gfx/button_dp2.jpg";			
	dp3.src = "gfx/button_dp3.jpg";			
	document.images['dp'].src = dp1.src;			
	}			

function soc_reset()			
	{			
	soc1.src = "gfx/button_soc1.jpg";			
	soc2.src = "gfx/button_soc2.jpg";			
	soc3.src = "gfx/button_soc3.jpg";			
	document.images['soc'].src = soc1.src;			
	}			

function yac_reset()			
	{			
	yac1.src = "gfx/button_yac1.jpg";			
	yac2.src = "gfx/button_yac2.jpg";			
	yac3.src = "gfx/button_yac3.jpg";			
	document.images['yac'].src = yac1.src;			
	}			

function bio_reset()			
	{			
	bio1.src = "gfx/button_bio1.jpg";			
	bio2.src = "gfx/button_bio2.jpg";			
	bio3.src = "gfx/button_bio3.jpg";			
	document.images['bio'].src = bio1.src;			
	}			

function button(cat)			
	{			
	switch (cat)			
		{			
		case "ct":			
			ct1.src = "gfx/button_ct3.jpg";			
			ct2.src = "gfx/button_ct3.jpg";			
			ct3.src = "gfx/button_ct3.jpg";			
			document.images['ct'].src = ct3.src;			
			dp_reset();			
			soc_reset();			
			yac_reset();			
			bio_reset();			
			break			
		case "dp":			
			dp1.src = "gfx/button_dp3.jpg";			
			dp2.src = "gfx/button_dp3.jpg";			
			dp3.src = "gfx/button_dp3.jpg";			
			document.images['dp'].src = dp3.src;			
			ct_reset();			
			soc_reset();			
			yac_reset();			
			bio_reset();			
			break			
		case "soc":			
			soc1.src = "gfx/button_soc3.jpg";			
			soc2.src = "gfx/button_soc3.jpg";			
			soc3.src = "gfx/button_soc3.jpg";			
			document.images['soc'].src = soc1.src;			
			ct_reset();			
			dp_reset();			
			yac_reset();			
			bio_reset();			
			break			
		case "yac":			
			yac1.src = "gfx/button_yac3.jpg";			
			yac2.src = "gfx/button_yac3.jpg";			
			yac3.src = "gfx/button_yac3.jpg";			
			document.images['yac'].src = yac1.src;			
			ct_reset();			
			dp_reset();			
			soc_reset();			
			bio_reset();			
			break			
		case "bio":			
			bio1.src = "gfx/button_bio3.jpg";			
			bio2.src = "gfx/button_bio3.jpg";			
			bio3.src = "gfx/button_bio3.jpg";			
			document.images['bio'].src = bio1.src;			
			ct_reset();			
			dp_reset();			
			soc_reset();			
			yac_reset();			
			break			
		}			
	}