var menupic=Array();
var prepic=Array();
var navi;
function Init(nav)
{
		menupic[0]= new Image();
		menupic[1]= new Image();
		menupic[2]= new Image();
		menupic[3]= new Image();
		menupic[4]= new Image();
		menupic[5]= new Image();
		menupic[6]= new Image();
		menupic[7]= new Image();
		menupic[8]= new Image();
		menupic[9]= new Image();
		menupic[10]= new Image();
		menupic[11]= new Image();
		menupic[12]= new Image();
		menupic[13]= new Image();
		menupic[14]= new Image();
		menupic[15]= new Image();
		menupic[16]= new Image();
		menupic[17]= new Image();
		menupic[18]= new Image();
		menupic[19]= new Image();
		menupic[20]= new Image();
		menupic[21]= new Image();
		menupic[22]= new Image();
		menupic[23]= new Image();
				
		menupic[0].src="./img/1_1.png";
		menupic[1].src="./img/1_2.png";
		menupic[2].src="./img/2_1.png";
		menupic[3].src="./img/2_2.png";
		menupic[4].src="./img/3_1.png";
		menupic[5].src="./img/3_2.png";
		menupic[6].src="./img/4_1.png";
		menupic[7].src="./img/4_2.png";
		menupic[8].src="./img/5_1.png";
		menupic[9].src="./img/5_2.png";
		menupic[10].src="./img/6_1.png";
		menupic[11].src="./img/6_2.png";
		menupic[12].src="./img/t1.png";
		menupic[13].src="./img/t2.png";
		menupic[14].src="./img/t3.png";
		menupic[15].src="./img/t4.png";
		menupic[16].src="./img/t5.png";
		menupic[17].src="./img/t6.png";
		menupic[18].src="./img/7_1.png";
		menupic[19].src="./img/7_2.png";
		menupic[20].src="./img/8_1.png";
		menupic[21].src="./img/8_2.png";
		menupic[22].src="./img/9_1.png";
		menupic[23].src="./img/9_2.png";
		
		prepic[0]=new Image();
		prepic[1]=new Image();
		prepic[2]=new Image();
		prepic[3]=new Image();
		prepic[4]=new Image();
		prepic[5]=new Image();
		prepic[6]=new Image();
		prepic[7]=new Image();
		prepic[8]=new Image();
		prepic[9]=new Image();		
		prepic[10]=new Image();
		prepic[11]=new Image();
		
		prepic[0].src="./img/lg.png";
		prepic[1].src="./img/ro.png";
		prepic[2].src="./img/roy.png";
		prepic[3].src="./img/rv.png";
		prepic[4].src="./img/rvy.png";
		prepic[5].src="./img/ry.png";
		prepic[6].src="./img/ytausta.png";
		prepic[7].src="./img/rva.png";
		prepic[8].src="./img/roa.png";
		prepic[9].src="./img/ra.png";
		prepic[10].src="./img/pixel.png";
		prepic[11].src="./img/atausta.png";
		
		navi=nav;
		roll_over("b"+navi,'');
		return;	
}
function roll_over(img_name, img_src)
{
   str="b"+navi;
	if(str!=img_name)
	{
       document[img_name].src = img_src;
	}
	else
	{
	    document[img_name].src = "./img/"+navi+"_2.png";
	}
}