if (document.Images) {
 var imgPath = "Images/"
 var nav_confused1 = new Image; nav_confused1.src = imgPath + "bt_confused_on.gif";
 var nav_confused0 = new Image; nav_confused0.src = imgPath + "bt_confused.gif"; 
 var nav_money1 = new Image; nav_money1.src = imgPath + "bt_money_on.gif";
 var nav_money0 = new Image; nav_money0.src = imgPath + "bt_money.gif"; 
 var nav_eco1 = new Image; nav_eco1.src = imgPath + "bt_eco_on.gif";
 var nav_eco0 = new Image; nav_eco0.src = imgPath + "bt_eco.gif"; 

  
}

//**************************************************************//

function doRollover(imgName, onOff) {
	if (document.images) {
	var targetObj = eval(imgName+onOff);
		if (document.images[imgName] != null && targetObj != null) {
		document.images[imgName].src = targetObj.src;
		}
	}
}


<!--

function roll(img_name1, img_src1, img_name2, img_src2)
   {
   document[img_name1].src = img_src1;
   document[img_name2].src = img_src2;
   }
   
function roll1(img_name1, img_src1)
   {
   document[img_name1].src = img_src1;

   }

//-->