//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
//
function addLoadEvent(func)
{	
var oldonload = window.onload;
	if (typeof window.onload != 'function'){
	 	window.onload = func;
	} else {
  	window.onload = function(){
		oldonload();
		func();
		}
	}

}



//
// グローバルナビの説明表示対応
//
function showNaviDescription(naviId) {
	var naviDescription = document.getElementById('naviDescription');
	
	if (naviId != '' ) {
		naviDescription.style.backgroundImage = 'url(http://www.csij.org/images/menu/desc_'+naviId+'.gif)';
	} else {
		naviDescription.style.backgroundImage = 'url(http://www.csij.org/images/menu/menu_desc.gif)';
	}
}