//add 2nd param by erwindraft
	function displayBlock(Show_block,bottom_link){
		//add by erwindraft
		$("ul.tabs li").removeClass("active"); //Remove any "active" class
		var arrow_id = '#'+bottom_link;
		$(arrow_id).addClass("active"); //Add "active" class to selected tab
		
		
		if (document.getElementById(Show_block)==null) {
		
			return
		}
		
		changeOpac(100,Active_block);
		changeOpac(0,Show_block);
			
		opacity(Active_block, 100, 0, 500);	
		
		var hide_block = document.getElementById(Active_block);		
		hide_block.style.display='none';
		
		Active_block = Show_block;
				
		var disp_block = document.getElementById(Show_block);
	
		disp_block.style.display='';
				
		opacity(Show_block, 0, 100, 500);
	}
	
	function showPortfolio(ch) {
						
		if (ch==0) {
			
			//go back
			if (CurPortf_block!=1) {
				
				var hide_block = document.getElementById('portf'+CurPortf_block);				
				hide_block.style.display='none';
				
				CurPortf_block = CurPortf_block -1;
				
				var disp_block = document.getElementById('portf'+CurPortf_block);
							
				disp_block.style.display='';
				//changeOpac(100,disp_block);			
				
				//opacity(disp_block, 0, 100, 500);
				
				if (CurPortf_block==1) {
				
					var lnk = document.getElementById('prev');
					lnk.style.visibility = 'hidden';
					
					var lnk = document.getElementById('next');
					lnk.style.visibility = '';
				
				} else {
				
					var lnk = document.getElementById('next');
					lnk.style.visibility = '';
				}
				
			}
		
		} else {
									
			if (CurPortf_block!=Total_blocks) {
				
				var hide_block = document.getElementById('portf'+CurPortf_block);
				hide_block.style.display='none';
				
				CurPortf_block = CurPortf_block +1;
				
				var disp_block = document.getElementById('portf'+CurPortf_block);
								
				disp_block.style.display='';
				//changeOpac(100,disp_block);
				
				//opacity(disp_block, 0, 100, 500);
												
				if (CurPortf_block==Total_blocks) {
				
					var lnk = document.getElementById('next');
					lnk.style.visibility = 'hidden';
					
					var lnk = document.getElementById('prev');
					lnk.style.visibility = '';
					
				} else {
				
					var lnk = document.getElementById('prev');
					lnk.style.visibility = '';
				}
				
			}			
		
		}		
		
	}
	
	
	
	
		function showRoll(menuItem) {
					
			var bg = document.getElementById(menuItem);			
			bg.style.visibility = '';
			bg.style.display = '';
			//changeOpac(0,menuItem);			
			//opacity(menuItem, 0, 100, 150);
		}
		
		function hideRoll(menuItem) {

			//changeOpac(100,menuItem);	
			//opacity(menuItem, 100, 0, 50);						
			var bg = document.getElementById(menuItem);
			bg.style.visibility = 'hidden';
			
		}