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var dge=document.getElementById;

function toggleLayers(a,b) {
	if(!dge)return;

	document.getElementById('content_D').style.display='none' ;
	document.getElementById('content_C').style.display='none' ;
	document.getElementById('content_B').style.display='none' ;
	document.getElementById('content_A').style.display='none' ;

	document.getElementById('tab_D').className='tab' ;
	document.getElementById('tab_C').className='tab' ;
	document.getElementById('tab_B').className='tab' ;
	document.getElementById('tab_A').className='tab' ;

	document.getElementById(b).className='tabon' ;

	  document.getElementById(a).style.display =
	  (document.getElementById(a).style.display=='block')?
	  'none':'block';

	  return false;
}



function externalLinks() {
if (!document.getElementsByTagName) return;
var anchors = document.getElementsByTagName("a");
for (var i=0; i<anchors.length; i++) {
var anchor = anchors[i];
if (anchor.getAttribute("href") &&
 anchor.getAttribute("rel") == "external")
anchor.target = "_blank";
}
}
window.onload = externalLinks; 


// - end hiding -->