function chgimg(idname, imgover)
	{
		idname.src = imgover 
	}

	function chgcolor(idname, over)
	{
	var over;
	if (over =='1')
		{idname.bgColor = "#fff8dc"} 
	else
		{idname.bgColor = "white"}	
	}
	
	function disp_on4a()
	{
		if (pk2.style.display == "none")
		{
			pk2.style.display=""
			pk1.style.display="none"
		}
	else
		{	pk2.style.display="none"
			
		}
	}