function num_up(){

var num;

num = document.getElementById("item_num").value;

if(num < 99){num++;}

document.getElementById("item_num").value=num;

}



function num_down(){

var num;

num = document.getElementById("item_num").value;

if(num > 1){num--;}

document.getElementById("item_num").value=num;

}

function num_up2(){

var num;

num = document.getElementById("item_num2").value;

if(num < 99){num++;}

document.getElementById("item_num2").value=num;

}



function num_down2(){

var num;

num = document.getElementById("item_num2").value;

if(num > 1){num--;}

document.getElementById("item_num2").value=num;

}

function pic_chenge1(picvalue){

pic_file = pic_name;

document.getElementById("main_pic").src = picvalue; 



}

function pic_chenge(picvalue){


document.getElementById('main_pic').innerHTML = "<img src='"+picvalue+"' width='240' height='240'/>";


}