function add_onload(element, new_function) {
	var old_onload = element.onload;

	if (typeof old_onload != 'function') {
		old_onload = function(){};
	}

	element.onload = function (){
		old_onload();
		new_function();
	}
}

function add_onunload(element, new_function) {
	var old_onunload = element.onunload;

	if (typeof old_onunload != 'function') {
		old_onunload = function(){};
	}

	element.onunload = function (){
		old_onunload();
		new_function();
	}
}

function add_onfocus(element, new_function) {
	var old_onfocus = element.onfocus;

	if (typeof old_onfocus != 'function') {
		old_onfocus = function(){};
	}

	element.onfocus = function (){
		old_onfocus();
		new_function();
	}
}

function trim(stringToTrim) {
	return stringToTrim.replace(/^\s+|\s+$/g,"");
}

function limitTextarea(elm,limit,display_id,limit_id) {
  $(limit_id).value = limit - (elm.value.length);
  if ($(limit_id).value > 1) {
  	$(display_id).innerHTML = limit - elm.value.length+' characters remaining.';
  }
  if ($(limit_id).value == 1) {
  	$(display_id).innerHTML = '1 character remaining.';
 	}
  if ($(limit_id).value == 0) {
  	$(display_id).innerHTML = '0 characters remaining.';
 	}
 	if ($(limit_id).value < 0) {
 		$(display_id).innerHTML = limit - elm.value.length+' characters remaining, excess characters will be truncated.';
 	}
}

function callbackLink(href, element_id, inner_html) {
	$(element_id).href = href;	
	if (href == '' || href == 'javascript:;') {
		$(element_id+'_hidden').value = '';
		$(element_id).innerHTML = 'Add a Link';
		$(element_id).title = 'Add a Link';
		$(element_id+'_delete').hide();
	} else {
		if (inner_html === undefined) {
			inner_html = href.truncate(30);
		}
		$(element_id+'_hidden').value = href;
		$(element_id).innerHTML = inner_html;
		$(element_id).title = href;
		$(element_id).target = '_blank';
		$(element_id+'_delete').show();
	}
}