function ShowOrHide(d1, d2) {
      if (d1 != '') DoDiv(d1);
      if (d2 != '') DoDiv(d2);
    }
    function DoDiv(id) {
      var item = null;
      if (document.getElementById) {
        item = document.getElementById(id);
      } else if (document.all){
        item = document.all[id];
      } else if (document.layers){
        item = document.layers[id];
      }
      if (!item) {
      }
      else if (item.style) {
        if (item.style.display == "none"){ item.style.display = ""; }
        else {item.style.display = "none"; }
      }else{ item.visibility = "show"; }
     }
function overlayclose(subobj){
document.getElementById(subobj).style.display="none"
}
function fin_guitar2(it) {
var ahi = new Array('guitar2-1','guitar2-2');
for(var i=0;i<ahi.length;i++) {
document.getElementById(ahi[i]).style.display='none';
document.getElementById(ahi[i]+'_tab').className='';
}
document.getElementById(it).style.display='block';
document.getElementById(it).blur();
document.getElementById(it+'_tab').className='active';
}
function fin_guitar3(it) {
var ahi = new Array('guitar3-1','guitar-2','guitar3-3');
for(var i=0;i<ahi.length;i++) {
document.getElementById(ahi[i]).style.display='none';
document.getElementById(ahi[i]+'_tab').className='';
}
document.getElementById(it).style.display='block';
document.getElementById(it).blur();
document.getElementById(it+'_tab').className='active';
}

/***********************************************
* Drop Down/ Overlapping Content- © Dynamic Drive (www.dynamicdrive.com)
* This notice must stay intact for legal use.
* Visit http://www.dynamicdrive.com/ for full source code
***********************************************/

function getposOffset(overlay, offsettype){
var totaloffset=(offsettype=="left")? overlay.offsetLeft : overlay.offsetTop;
var parentEl=overlay.offsetParent;
while (parentEl!=null){
totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
parentEl=parentEl.offsetParent;
}
return totaloffset;
}

function overlay(curobj, subobjstr, opt_position){
if (document.getElementById){
var subobj=document.getElementById(subobjstr)
subobj.style.display=(subobj.style.display!="block")? "block" : "none"
var xpos=getposOffset(curobj, "left")+((typeof opt_position!="undefined" && opt_position.indexOf("right")!=-1)? -(subobj.offsetWidth-curobj.offsetWidth) : 0) 
var ypos=getposOffset(curobj, "top")+((typeof opt_position!="undefined" && opt_position.indexOf("bottom")!=-1)? curobj.offsetHeight : 0)
subobj.style.left=xpos+"px"
subobj.style.top=ypos+"px"
return false
}
else
return true
}

function overlayclose(subobj){
document.getElementById(subobj).style.display="none"
}