function stretch() {
	var minimum_height = 800;
	var win_height = getSize();

	var page_total = document.getElementById('central_column');
	var page_content = document.getElementById('MainContent');
	var page_header = document.getElementById('header');
	var page_footer = 0; //document.getElementById('footer');	

	var page_content_h = page_content.offsetHeight;
	var page_header_h = page_header.offsetHeight + 190 ; // The last figure (190) corresponds to the height of the pic under the header  div
	var page_footer_h = 0; //page_footer.offsetHeight;

	var ideal_height = win_height - (page_header_h + page_footer_h);
	
	page_content.style.minHeight = ideal_height + "px"; // RESIZE
}

function getSize() {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }
  //window.alert( 'Width = ' + myWidth );
  //window.alert( 'Height = ' + myHeight );
  return myHeight;
}

function dsp(loc,id){
   if(document.getElementById){
      var foc = loc.firstChild;
      
	  foc = loc.firstChild.innerHTML?loc.firstChild:loc.firstChild.nextSibling;
      foc.innerHTML = foc.innerHTML == '-'?'+':'-';
            
	  foc = document.getElementById("hidden_"+id);
	  
      foc.style.display = foc.style.display == 'block'?'none':'block';
	}
}