function swapImage(id,state) {
 document.getElementById(id).src = document[id + '_' + state].src; 
}

function createSwapImages(name,filename) {
 var img_loc_prefix = '';
	//alert(name);
	if (document.getElementById(name) != undefined) {
  var tmp = document.getElementById(name).src.split('/');
  for (i=0;i<tmp.length-1;i++) img_loc_prefix += tmp[i] + '/';
  document[name + '_on'] = new Image();
  document[name + '_on'].src = img_loc_prefix + filename + '_on.gif';
  document[name + '_off'] = new Image();
  document[name + '_off'].src = img_loc_prefix + filename + '.gif';
	}
}
window.onload = function() {
	createSwapImages('imgTabs01','tabs_01');
	createSwapImages('imgTabs02','tabs_02');
	createSwapImages('imgTabs03','tabs_03');
	createSwapImages('imgTabs04','tabs_04');
	createSwapImages('imgTabs05','tabs_05');
	createSwapImages('imgTabs06','tabs_06');
}