// JavaScript Document
/** submenu fuctions: display main menu's subs menu
  * 
  * @param  obejct link. a object 
  *
  * @param  int  $itemNumber: the sub menu must has id = sub_$itemNumber
  *
  * @param string block preif: maintabs_, othertabs_ etc..
  *
  * @param string  selected: classname of current element
  *
  * @param stirng  clear: classname of othter elements
  */
  
function openTab( link, itemNumber, sizeOfLinks, prefix, selected, clear )
{
	
	
     var parentEl = document.getElementById( prefix + "main_" + itemNumber );
     var subEl    = document.getElementById( prefix + "sub_" + itemNumber );
 
       
     if( parentEl )
     {
           for( var cL = 0; cL < sizeOfLinks; cL ++ )
	   {
	         var parentOther =  document.getElementById( prefix + "main_" + cL ); 
		 var subOther    =  document.getElementById( prefix + "sub_" + cL ); 

		 if( parentOther )
		 {
		         parentOther.className = clear;
		 }
		 
		 if( subOther )
		 {
		     subOther.style.display = "none"; 
		 }
	   }     
	   parentEl.className = selected;
	   
	   if( subEl )
	   {
	        subEl.style.display = "block"; 

	   }
     }

     return false;
}