function updateElmntHt(upd_elmnt,base_elmnt,offset){
	if (validateElmntID(upd_elmnt) && validateElmntID(base_elmnt)){	
		var min_height = getBaseElmnMinHeight(upd_elmnt);
		var new_height = calcNewHeight(base_elmnt,offset,min_height);
		if(min_height > new_height){
			setElmntHeight(base_elmnt,min_height-offset);
		}else{
			setElmntHeight(upd_elmnt,new_height);
		}
	}
};
function setElmntHeight(elmnt_id,new_height){
	$(elmnt_id).css("height",new_height.toString()+'px');
};
function getBaseElmnMinHeight(elmnt_id){
	var elmnt_ht = $(elmnt_id).height();
	return elmnt_ht;
}
function calcNewHeight(elmnt_id,offset,min_height){			
	var elmnt_ht = $(elmnt_id).height();
	var uH = (elmnt_ht + offset);
	return uH;
};
function validateElmntID(elmnt_id){
	return true;
}

function moveRailPic(){
  
}