function show_img()
{

	var img_width = document.images.front_img.offsetWidth;
	var img_height = document.images.front_img.offsetHeight;

			var scr_width = window.screen.width;
			var scr_height = window.screen.height;
			
			var trans_width = scr_width;
			var trans_height = scr_height;
			var is_layer_width = scr_width;
			var is_layer_height = scr_height;
			
			switch(scr_width)
			{
					case 1680 : 
					{
						if ((900/img_width)<(675/img_height))
							{
							document.images.front_img.style.width="900px";
							}
						else
							{
							document.images.front_img.style.height="675px";
							} 
					} break;
					
					case 1280 : 
					{
						if ((800/img_width)<(600/img_height))
							{
							document.images.front_img.style.width="800px";
							}
						else
							{
							document.images.front_img.style.height="600px";
							} 
					} break;
					
					case 1024 : 
					{
						if ((640/img_width)<(480/img_height))
							{
							document.images.front_img.style.width="640px";
							}
						else
							{
							document.images.front_img.style.height="480px";
							} 
					} break;
					default:
					{
						if ((320/img_width)<(240/img_height))
							{
							document.images.front_img.style.width="320px";
							}
						else
							{
							document.images.front_img.style.height="240px";
							}
					}
			}
						
			var is_transparent = document.getElementById("is_trans");
			is_transparent.style.width = trans_width+ 'px';
			is_transparent.style.height = trans_height+ 'px';
			
			var img_on_is_layer = document.getElementById("img_on_is_layer");
			img_on_is_layer.style.width = is_layer_width+ 'px';
			img_on_is_layer.style.height = is_layer_height+ 'px';
			var end_left = (scr_width - is_layer_width)/2;
			img_on_is_layer.style.left =  end_left  + 'px';
			
			var is_layer = document.getElementById("is_layer");
			is_layer.style.width = scr_width+ 'px';
			is_layer.style.height = trans_height+ 'px';

			is_layer.style.visibility = "visible";
			fadeIt();			
		}

function clr_img()
{
	document.getElementById("is_layer").style.visibility = "hidden";	
}
		
function load_img(img_)
{
	document.getElementById("img_on_is_layer").innerHTML = "<img src='"+img_+"' name='front_img' />"; 
	show_img();	
}

var c=0;
var t;
var is_on=0;

function fade()
{
	document.getElementById('img_on_is_layer').style.opacity='.'+ c;
	if (c < 9) {c=c+1;} else c= 99;
	t=setTimeout("fade()",100);
}

function fadeIt()
{
	if (!is_on)
  		{
  			is_on=1;
			fade();
  		}
}

function stopCount()
{
	clearTimeout(t);
	is_on=0;
	//unset(c);
	c=null;
}