function calc_greeting_height(obj){	
	var number_of_ch = 34;
	var len = document.getElementById(obj).value.length;
	var height = len / number_of_ch;
	document.getElementById(obj).rows = height+countLines(obj);
}
function calc_general_textarea_height(obj){
	var number_of_ch = 50;
	var len = document.getElementById(obj).value.length;
	var height = len / number_of_ch;
	document.getElementById(obj).rows = height+countLines(obj);
}
function countLines(obj) { 
  var area = document.getElementById(obj) 
        // trim trailing return char if exists 
  var text = area.value.replace(/\s+$/g,"") 
  var split = text.split("\n") 
  return split.length 
}
function switch_event_picture(event_pic_view){
	document.getElementById('event_pic_view_1').style.display = 'none';
	document.getElementById('event_pic_view_2').style.display = 'none';
	document.getElementById('event_pic_view_3').style.display = 'none';
	document.getElementById(event_pic_view).style.display = '';
}