function eval_location() {

// ascertain the document location and image path
var here=new String(document.location);
//alert(here);

// work through the keywords and test one is in the location
for (i=0;i<mkeys.length;i++)
{
	// set the image to the down state
	if (here.indexOf(mkeys[i])>-1)
	{
		path=new String(document.images['l2'+mkeys[i]].src);

		// get the path to the graphics folder
		path = path.substring(0,path.lastIndexOf("/")+1);	
		MM_nbGroup('down','navbar1','l2'+mkeys[i],path+'l2-'+mkeys[i]+'-d.gif',1);
		//alert(mkeys[i]);
		if (typeof(skeys) != 'undefined'){					
			for (j=0; j<skeys.length;j++)
			{
				if (here.indexOf(skeys[j])>-1)
				{
					//alert(skeys[j]);
					path=new String(document.images[skeys[j]].src);			//var temp=mkeys[i]+skeys[j];
					path = path.substring(0,path.lastIndexOf("/")+1);//var temp2=mkeys[i]+'/'+skeys[j]+'-d.gif';
					MM_nbGroup('down','navbar2',skeys[j],path+skeys[j]+'-d.gif',1);
					
					/* third level navigation */
					//alert ('tkeys is '+typeof(tkeys));
					if (typeof(tkeys) != 'undefined'){
					
						for (k=0; k<tkeys.length; k++) {
							if (here.indexOf(tkeys[k])>-1){
								//alert(here);
								path = new String(document.images[tkeys[k]].src);
								path = path.substring(0,path.lastIndexOf("/")+1);
								//alert (path);
								MM_nbGroup('down','navbar3',tkeys[k],path+tkeys[k]+'-d.gif',1);
								//alert(tkeys[k]);
								break;
							}
						}
					}
					break;
			}
				
			}
		}
	return;
	}
}
return true;
}