function getPrev(data){
						ptgt = 0;
						thispic = 0;
						myleg = 0;
						for (key in tractor){
							if(data.indexOf(tractor[key])>-1){
								thispic = key;
							}
							myleg = key;
						}
						if(thispic == 1){
							ptgt = myleg;
						} else {
							ptgt = thispic - 1;
						}
						darken_two();
						setTimeout("illuminate('"+tractor[ptgt]+"',1,0,0)",1000);
					}
					function getNext(data){
						ptgt = 0;
						thispic = 0;
						myleg = 0;
						msg = "";
						for (key in tractor){
							if(data.indexOf(tractor[key])>-1){
								thispic = key;
							}
							myleg = key;
						}
						if(thispic == myleg){
							ptgt = 1;
						} else {
							ptgt = parseInt(thispic) + 1;
						}
						darken_two();
						setTimeout("illuminate('"+tractor[ptgt]+"',1,0,0)",1000);
					}
						var numpics = 17;
						limitleft = parseInt(numpics*100)*-1;