function checkIt(string)
{
	var detect = navigator.userAgent.toLowerCase();
	var thestring;
	place = detect.indexOf(string) + 1;
	thestring = string;
	return place;
}

function changeTab(thistab) {


var thestyle;

if (checkIt('msie'))
{
	
	thestyle= "block";
	
}else{
	
	thestyle= "table";
	
}


var tab1;
var tab2;
var changetab;

switch(thistab){
case "1":
tab1 = "tab2";
tab2 = "tab3";
changetab = "tab1";
break
case "2":
tab1 = "tab1";
tab2 = "tab3";
changetab = "tab2";
break
case "3":
tab1 = "tab1";
tab2 = "tab2";
changetab = "tab3";
break
}



var i=0;


	for (i=1; i<=3; i++) 
	{
	
	var whichtab="tab"+i;
	var head_l_off= "tab"+i+"head_l";
	var head_m_off= "tab"+i+"head_m";
	var head_r_off= "tab"+i+"head_r";
	
	
			if (document.getElementById) { // DOM3 = IE5, NS6
					document.getElementById(whichtab).style.display = 'none';
					document.getElementById(head_l_off).className= 'left';
					document.getElementById(head_m_off).className= 'middle';
					document.getElementById(head_r_off).className= 'right';
				}
				else {
					if (document.layers) { // Netscape 4
						document.whichtab.display = 'none';
						document.head_l_off.className='left';
						document.head_m_off.className='middle';
						document.head_r_off.className='right';
					}
					else { // IE 4
						document.all.whichtab.style.display = 'none';
						document.all.head_l_off.className = 'left';
						document.all.head_m_off.className = 'middle';
						document.all.head_r_off.className = 'right';
					}
				}
			
			
			
	}
	

	var head_l= changetab+"head_l";
	var head_m= changetab+"head_m";
	var head_r= changetab+"head_r";
	
	
	
	if (document.getElementById) { // DOM3 = IE5, NS6
					document.getElementById(changetab).style.display = thestyle;
					document.getElementById(head_l).className= 'lefton';
					document.getElementById(head_m).className= 'middleon';
					document.getElementById(head_r).className= 'righton';
				}
				else {
					if (document.layers) { // Netscape 4
						document.changetab.display = thestyle;
						document.head_l.className='lefton';
						document.head_m.className='middleon';
						document.head_r.className='righton';
					}
					else { // IE 4
						document.all.changetab.style.display = thestyle;
						document.all.head_l.className = 'lefton';
						document.all.head_m.className = 'middleon';
						document.all.head_r.className = 'righton';
					}
				}

}


if (document.images) {
    beginnerup       = new Image();
    beginnerup.src   = "/images/buttons/beginner.gif" ;
    beginnerdown     = new Image() ;
    beginnerdown.src = "/images/buttons/beginner_over.gif" ;
    
    enthusiastup       = new Image();
    enthusiastup.src   = "/images/buttons/enthusiast.gif" ;
    enthusiastdown     = new Image() ;
    enthusiastdown.src = "/images/buttons/enthusiast_over.gif" ;
    
    best_buysup       = new Image();
    best_buysup.src   = "/images/buttons/best_buys.gif" ;
    best_buysdown     = new Image() ;
    best_buysdown.src = "/images/buttons/best_buys_over.gif" ;
}
function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}


sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);