// JavaScript Document
function showMenuBg(i){
    for(j=1; j<=6; j++){
		if(j == i){
			document.getElementById("menu_btn0"+i).className="on";
			switch (i){
				case 1:
				  document.getElementById("downlist").height = 2350;
				  document.getElementById("downlist").src = "downpage/all.html";
				  break;
				case 2:
				  document.getElementById("downlist").height = 725;
				  break;
				case 3:
				  document.getElementById("downlist").height = 725;
				  break;
				case 4:
				  document.getElementById("downlist").height = 1075;
				  break;
				case 5:
				  document.getElementById("downlist").height = 725;
				  break;
				case 6:
				  document.getElementById("downlist").height = 725;
				  break;
			}
				
		}else{
			document.getElementById("menu_btn0"+j).className=" ";
		}
	}
}

window.onscroll = function scrollCollumn()
{
	var oFix = document.getElementById("downcate");
	if(document.documentElement.scrollTop>137){
		var vtop = document.documentElement.scrollTop - 136;
		oFix.style.top = vtop + "px";
	}else{
		oFix.style.top = 0;
	}
}
setTimeout("showMenuBg(1)",200);