// convert all characters to lowercase to simplify testing 
    var agt=navigator.userAgent.toLowerCase(); 

    // *** BROWSER VERSION *** 
    var is_major = parseInt(navigator.appVersion); 
    var is_minor = parseFloat(navigator.appVersion); 

    var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1) 
                && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1) 
                && (agt.indexOf('webtv')==-1)); 
    var is_nav2 = (is_nav && (is_major == 2)); 
    var is_nav3 = (is_nav && (is_major == 3)); 
    var is_nav4 = (is_nav && (is_major == 4)); 
    var is_nav4up = (is_nav && (is_major >= 4)); 
    var is_navonly      = (is_nav && ((agt.indexOf(";nav") != -1) || 
                          (agt.indexOf("; nav") != -1)) ); 
    var is_nav5 = (is_nav && (is_major == 5)); 
    var is_nav5up = (is_nav && (is_major >= 5)); 
	var is_nav6 = (is_nav && (is_major >= 5) && (agt.indexOf("netscape6/6.0")!=-1) );

    var is_ie   = (agt.indexOf("msie") != -1); 
    var is_ie3  = (is_ie && (is_major < 4)); 
    var is_ie4  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")==-1) ); 
    var is_ie4up  = (is_ie  && (is_major >= 4)); 
    var is_ie5  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) ); 
    var is_ie5up  = (is_ie  && !is_ie3 && !is_ie4); 

    var is_aol   = (agt.indexOf("aol") != -1); 
    var is_aol3  = (is_aol && is_ie3); 
    var is_aol4  = (is_aol && is_ie4); 

    var is_opera = (agt.indexOf("opera") != -1); 
    var is_webtv = (agt.indexOf("webtv") != -1); 

    // *** PLATFORM ***
    var is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
    var is_mac    = (agt.indexOf("mac")!=-1);
 
 function checkwin(name)
 {
	if (window.name != name)
	{
		openwin(window.location.href,name,804);
		window.location.href="/index.php";
	}	
 }

 function openwin(url,name,width,height,scrolls)
 {
	if (!height) height = 600;
	if ( is_mac && is_nav4up ) height +=35;
	if (!scrolls) scrolls="no";


	if (window.screen.availHeight <= 600)
		window.open(url,name,"width="+width+",height=480,resizable=no,menubar=no,locationbar=no,scrollbars=yes,toolbar=no,status=no").focus();	
	else
		window.open(url,name,"width="+width+",height="+height+",resizable=no,menubar=no,locationbar=no,scrollbars="+scrolls+",toolbar=yes,status=no").focus();	
	
 }