function init(){

	document.getElementById("btProd_01").onmouseover = function(){document.getElementById("sub_prod_01").style.display = 'block';}; 
	document.getElementById("btProd_01").onmouseout = function(){document.getElementById("sub_prod_01").style.display = 'none';}; 
	document.getElementById("sub_prod_01").onmouseout = function(){document.getElementById("sub_prod_01").style.display = 'none';}; 
	document.getElementById("sub_prod_01").onmouseover = function(){document.getElementById("sub_prod_01").style.display = 'block';};
	
	document.getElementById("btProd_02").onmouseover = function(){document.getElementById("sub_prod_02").style.display = 'block';}; 
	document.getElementById("btProd_02").onmouseout = function(){document.getElementById("sub_prod_02").style.display = 'none';}; 
	document.getElementById("sub_prod_02").onmouseout = function(){document.getElementById("sub_prod_02").style.display = 'none';}; 
	document.getElementById("sub_prod_02").onmouseover = function(){document.getElementById("sub_prod_02").style.display = 'block';};

	document.getElementById("btProd_03").onmouseover = function(){document.getElementById("sub_prod_03").style.display = 'block';}; 
	document.getElementById("btProd_03").onmouseout = function(){document.getElementById("sub_prod_03").style.display = 'none';}; 
	document.getElementById("sub_prod_03").onmouseout = function(){document.getElementById("sub_prod_03").style.display = 'none';}; 
	document.getElementById("sub_prod_03").onmouseover = function(){document.getElementById("sub_prod_03").style.display = 'block';};

	document.getElementById("btProd_04").onmouseover = function(){document.getElementById("sub_prod_04").style.display = 'block';}; 
	document.getElementById("btProd_04").onmouseout = function(){document.getElementById("sub_prod_04").style.display = 'none';}; 
	document.getElementById("sub_prod_04").onmouseout = function(){document.getElementById("sub_prod_04").style.display = 'none';}; 
	document.getElementById("sub_prod_04").onmouseover = function(){document.getElementById("sub_prod_04").style.display = 'block';};
}

window.onload=init