bt1a=new Image();  bt1b=new Image();	
bt2a=new Image();  bt2b=new Image();  bt2c=new Image();  
bt2d=new Image();  bt2e=new Image();  bt2f=new Image();
bt3a=new Image();  bt3b=new Image();

bt1a.src="images/bts_loca.gif";  bt1b.src="images/bts_loca_c.gif";
bt2a.src="images/bts_locb.gif";  bt2b.src="images/bts_loca.gif";  bt2c.src="images/bts_cale.gif";  
bt2d.src="images/bts_locb_c.gif";  bt2e.src="images/bts_loca_c2.gif";  bt2f.src="images/bts_cale_c2.gif";
bt3a.src="images/bts_cale.gif";  bt3b.src="images/bts_cale_c.gif";

function show(num){
	if (num=="1")  {
	document.images.attractions.src=bt1a.src;
	}
	if (num=="10") {
	document.images.attractions.src=bt1b.src;
	}
	if (num=="2")  {
	document.images.business.src=bt2a.src;  
	document.images.attractions.src=bt2b.src;
	document.images.calendar.src=bt2c.src;
	}
	if (num=="20") {
	document.images.business.src=bt2d.src;
	document.images.attractions.src=bt2e.src;
	document.images.calendar.src=bt2f.src;
	}
	if (num=="3")  {
	document.images.calendar.src=bt3a.src;
	}
	if (num=="30") {
	document.images.calendar.src=bt3b.src;
	}
}