pres1=new Image(78,16); pres1.src='images/pres1.gif';
pres2=new Image(78,16); pres2.src='images/pres2.gif';
act1=new Image(44,16); act1.src='images/act1.gif';
act2=new Image(44,16); act2.src='images/act2.gif';
voice1=new Image(77,13); voice1.src='images/voice1.gif';
voice2=new Image(77,13); voice2.src='images/voice2.gif';
con1=new Image(57,11); con1.src='images/con1.gif';
con2=new Image(57,11); con2.src='images/con2.gif';

function changepic (imgTagName, imgObj) {
if (document.images) {
   document.images[imgTagName].src=imgObj.src}
}