your template set to display at 95% .. but there is a width in body set to 70%
open your stylesheet_tm.css and remove width:70%; from body

body{
padding:0;
margin:0;
width:70%;
vertical-align:top;
background:#000000;
font-family:tahoma; font-size:11px; line-height:14px; color:#63676B;
}


there are no module to resize page on your visitors screen . majority of people do have a monitor with high resolution ..i like fixed websites and not fluied . i set the size at 980px .
older IE do have problem with PNG .. there are number of hacks and fixes on internet .. look for pngfix . they tend to be javascript that need to be added to your site to fix the issue that older IE browser have ith PNG , i found those hacks make the site slower.