function set_div_bottom(layerMain, layerLastDiv) 
  {
    var layermain_bottompos = 0;
    var cl                  = 0;  
	var lastdiv_top         = 0;
    var el                  = document.getElementById(layerLastDiv);
	var lastdiv_height      = document.getElementById(layerLastDiv).style.height ;
    var topdiv_height       = document.getElementById('Top').style.height ;

    // Compute top position of layerLastDiv
    if (el.offsetParent)
    {
	  do
   	  {
		lastdiv_top +=el.offsetTop;
	  }  
	  while(el=el.offsetParent);
   }
   
	layermain_bottompos = parseInt( lastdiv_top ,10) + parseInt( lastdiv_height ,10) - parseInt( topdiv_height, 10) - 15 ;

    
    document.getElementById(layerMain).style.position = "absolute";
	document.getElementById(layerMain).style.height   = layermain_bottompos+"px";

}

function set_div_bottom_popup(layerMain, layerLastDiv) 
  {
    var layermain_bottompos = 0;
    var cl                  = 0;  
	var lastdiv_top         = 0;
    var el                  = document.getElementById(layerLastDiv);
	var lastdiv_height      = document.getElementById(layerLastDiv).style.height ;

    // Compute top position of layerLastDiv
    if (el.offsetParent)
    {
	  do
   	  {
		lastdiv_top +=el.offsetTop;
	  }  
	  while(el=el.offsetParent);
   }
   
	layermain_bottompos = parseInt( lastdiv_top ,10) + parseInt( lastdiv_height ,10) - 15 ;

    document.getElementById(layerMain).style.position = "absolute";
	document.getElementById(layerMain).style.height   = layermain_bottompos+"px";
}

function get_div_bottom_pos(layer) 
  {
    var layermain_bottompos = 0;
    var cl                  = 0;  
	var lastdiv_top         = 0;
    var el                  = document.getElementById(layer);
	var lastdiv_height      = document.getElementById(layer).style.height ;
    var topdiv_height       = document.getElementById('Top').style.height ;

    // Compute top position of layerLastDiv
    if (el.offsetParent)
    {
	  do
   	  {
		lastdiv_top +=el.offsetTop;
	  }  
	  while(el=el.offsetParent);
   }
   
	layermain_bottompos = parseInt( lastdiv_top ,10) + parseInt( lastdiv_height ,10) ;

    return layermain_bottompos;
}