function HideContent(d) {
document.getElementById(d).style.display = "none";
}

function ReverseDisplay(d) {
if(document.getElementById(d).style.display == "none") { document.getElementById(d).style.display = "block"; }
else { document.getElementById(d).style.display = "none"; }
}

function ShowContent(d) {
  document.getElementById('toptxt_1a').style.display = "none";
  document.getElementById('toptxt_1b').style.display = "none";  
  document.getElementById('toptxt_1c').style.display = "none";  
  document.getElementById('toptxt_1d').style.display = "none";  
  document.getElementById(d).style.display = "block";
  
  if (d == 'toptxt_1a') {
  	document.getElementById('cont_1a').style.background = 'url(images/skyetel/bg-highlight.gif)'; 
	document.getElementById('cont_1b').style.background = "white";
    document.getElementById('cont_1c').style.background = "white";
	document.getElementById('cont_1d').style.background = "white";
  } 
  if (d == 'toptxt_1b') { 
    document.getElementById('cont_1a').style.background = "white";
    document.getElementById('cont_1b').style.background = 'url(images/skyetel/bg-highlight.gif)'; 
	document.getElementById('cont_1c').style.background = "white";
	document.getElementById('cont_1d').style.background = "white";
  }
   if (d == 'toptxt_1c') { 
    document.getElementById('cont_1a').style.background = "white";
    document.getElementById('cont_1b').style.background = "white";
	document.getElementById('cont_1c').style.background = 'url(images/skyetel/bg-highlight.gif)'; 
	document.getElementById('cont_1d').style.background = "white";
  } 
  if (d == 'toptxt_1d') { 
    document.getElementById('cont_1a').style.background = "white";
    document.getElementById('cont_1b').style.background = "white";
	document.getElementById('cont_1c').style.background = "white";
	document.getElementById('cont_1d').style.background = 'url(images/skyetel/bg-highlight.gif)'; 
  } 
}

function ShowContent_2(d) {
  document.getElementById('toptxt_2a').style.display = "none";
  document.getElementById('toptxt_2b').style.display = "none";
  document.getElementById('toptxt_2c').style.display = "none";  
  document.getElementById('toptxt_2d').style.display = "none";
  document.getElementById(d).style.display = "block";
  
  if (d == 'toptxt_2a') {
  	document.getElementById('cont_2a').style.background = 'url(images/skyetel/bg-highlight.gif)'; 
 	document.getElementById('cont_2b').style.background = "white";
	document.getElementById('cont_2c').style.background = "white";
	document.getElementById('cont_2d').style.background = "white";
  } if (d == 'toptxt_2b') { 
    document.getElementById('cont_2a').style.background = "white";
 	document.getElementById('cont_2b').style.background = 'url(images/skyetel/bg-highlight.gif)';
	document.getElementById('cont_2c').style.background = "white"; 	
	document.getElementById('cont_2d').style.background = "white"; 	
  } if (d == 'toptxt_2c') { 
    document.getElementById('cont_2a').style.background = "white";
 	document.getElementById('cont_2b').style.background = "white";
	document.getElementById('cont_2c').style.background = 'url(images/skyetel/bg-highlight.gif)';
	document.getElementById('cont_2d').style.background = "white";
  } if (d == 'toptxt_2d') { 
    document.getElementById('cont_2a').style.background = "white";
 	document.getElementById('cont_2b').style.background = "white";
	document.getElementById('cont_2c').style.background = "white";
	document.getElementById('cont_2d').style.background = 'url(images/skyetel/bg-highlight.gif)';
  } 

}



function ShowContent_3(d) {
  document.getElementById('toptxt_3a').style.display = "none";
  document.getElementById('toptxt_3b').style.display = "none";
  document.getElementById('toptxt_3c').style.display = "none"; 
  document.getElementById('toptxt_3d').style.display = "none";  
  document.getElementById(d).style.display = "block";
  
  if (d == 'toptxt_3a') {
  	document.getElementById('cont_3a').style.background = 'url(images/skyetel/bg-highlight.gif)';
 	document.getElementById('cont_3b').style.background = "white"; 
	document.getElementById('cont_3c').style.background = "white"; 	
	document.getElementById('cont_3d').style.background = "white";
  } if (d == 'toptxt_3b') { 
    document.getElementById('cont_3a').style.background = "white";
 	document.getElementById('cont_3b').style.background = 'url(images/skyetel/bg-highlight.gif)';
	document.getElementById('cont_3c').style.background = "white"; 	
	document.getElementById('cont_3d').style.background = "white";
  } if (d == 'toptxt_3c') { 
    document.getElementById('cont_3a').style.background = "white";
 	document.getElementById('cont_3b').style.background = "white"; 
	document.getElementById('cont_3c').style.background = 'url(images/skyetel/bg-highlight.gif)';
	document.getElementById('cont_3d').style.background = "white";
  } if (d == 'toptxt_3d') { 
    document.getElementById('cont_3a').style.background = "white";
 	document.getElementById('cont_3b').style.background = "white"; 
	document.getElementById('cont_3c').style.background = "white"; 	
	document.getElementById('cont_3d').style.background = 'url(images/skyetel/bg-highlight.gif)';
  } 

}



function ShowContent_4(d) {
  document.getElementById('toptxt_4a').style.display = "none";
  document.getElementById('toptxt_4b').style.display = "none";
  document.getElementById('toptxt_4c').style.display = "none";  
  document.getElementById('toptxt_4d').style.display = "none"; 
  document.getElementById(d).style.display = "block";
  
  if (d == 'toptxt_4a') {
  	document.getElementById('cont_4a').style.background = 'url(images/skyetel/bg-highlight.gif)';
 	document.getElementById('cont_4b').style.background = "white";
	document.getElementById('cont_4c').style.background = "white";
	document.getElementById('cont_4d').style.background = "white";
  } if (d == 'toptxt_4b') { 
    document.getElementById('cont_4a').style.background = "white";
 	document.getElementById('cont_4b').style.background = 'url(images/skyetel/bg-highlight.gif)';
	document.getElementById('cont_4c').style.background = "white";
	document.getElementById('cont_4d').style.background = "white";
  } if (d == 'toptxt_4c') { 
    document.getElementById('cont_4a').style.background = "white";
 	document.getElementById('cont_4b').style.background = "white";
	document.getElementById('cont_4c').style.background = 'url(images/skyetel/bg-highlight.gif)';
	document.getElementById('cont_4d').style.background = "white";
  } if (d == 'toptxt_4d') { 
    document.getElementById('cont_4a').style.background = "white";
 	document.getElementById('cont_4b').style.background = "white";
	document.getElementById('cont_4c').style.background = "white";
	document.getElementById('cont_4d').style.background = 'url(images/skyetel/bg-highlight.gif)';
  } 
  

}