function doRollover(elem, rollover_color){
            		// set background color of TD	
            		if (elem.parentNode)	{	
                			if (rollover_color == 'transparent'){ // Netscape does not like the word "transparent".
                    			elem.parentNode.bgColor = '';    
                			}
                			else{
				elem.parentNode.bgColor=rollover_color;
                			}
           		 }            
       	 }