function adobe(){
   var w = window.open("http://www.adobe.com/products/acrobat/readstep.html", "adobe", "width=640,height=300,resizable=yes,scrollbars=yes,toolbar=yes");
}

function open_window(href){
   var w = window.open(href, "acrobat", "width=640,height=400,resizable=yes,toolbar=no,scrollbar=yes,menu=no");
}