if(document.images) 
{ 
  impressive_on = new Image;
  impressive_on.src = 'img/sexy_on.gif';
  impressive_off = new Image;
  impressive_off.src = 'img/sexy_off.gif';  
  
}

function imgAct(img_name)
{
  if(document.images) {
    img_on = eval(img_name + '_on.src');      
	  document.getElementById(img_name).src = img_on;
  }
}

function imgInact(img_name)
{
  if(document.images) {
    img_off = eval(img_name + '_off.src');          
    document.getElementById(img_name).src = img_off;
  }
}