function resetpics(){
	pos=1;				// Number of 1st shown picture.	 
}

function movepics(line, pics)
	{
		pos += pics;
		
		//if(pos<1) pos++;
		if(pos < 1) pos = 1;
		//if(!$('line'+line+'_pic'+(pos+4))) pos--;


		var back_on = $('back'+line+'_on');
		var back_off = $('back'+line+'_off');
		var forward_on = $('forward'+line+'_on');
		var forward_off = $('forward'+line+'_off');

		back_on.className="off"; 
		back_off.className="off";
		forward_on.className="off";
		forward_off.className="off";
			
		if(!$('line'+line+'_pic'+(pos-1)) && $('line'+line+'_pic'+(pos+5))) {
			back_off.className="";
		} else {
			back_on.className=""; 
		}

		if(!$('line'+line+'_pic'+(pos+5)) && $('line'+line+'_pic'+(pos-1))) 
		{
			forward_off.className="";
		} else {
			forward_on.className=""; 
		}

		for(var i=1;;i++)
		{
			var o_m=$('line'+line+'_pic'+i);
			if(!o_m) break;
			if(i>=pos && i<=pos+4) {
				o_m.className="c"; 
			} else {
				o_m.className="c off"; 
			}
		}
		return false;
	}