if(java.lang.Math.abs(getheight(lc)-getheight(rc)) > 1){
			//can I pass the problem on?
			if(lc!=null){
				if(java.lang.Math.abs(getheight(lc.getrc())-getheight(lc.getlc())) > 1){
					checkavl(lc);
					return;
				}
			}
			if(rc!=null){
				if(java.lang.Math.abs(getheight(rc.getrc())-getheight(rc.getlc())) > 1){
					checkavl(rc);
					return;
				}
			}
			if(getheight(lc)>getheight(rc)){ //on what side is the problem?
				if(getheight(lc.getlc())>getheight(lc.getrc())){ //inwards or outwards?
					rotateright(anchor);
				}
				else{
					rotateleft(lc);
					rotateright(anchor);
				}
			}
			else{
				if(getheight(rc.getrc())>getheight(rc.getlc())){ //inwards or outwards?
					rotateleft(anchor);
				}
				else{
					rotateright(rc);
					rotateleft(rc);
				}
			}
		}