function openWin(url,name,w,h)
 {
    var x=(window.screen.width-w)/2;
	var y=(window.screen.height-h)/2;
	var win=window.open(url,name,'toolbar=0,location=0,status=0,top='+y+',left='+x+',width='+w+',height='+h );
	win.focus();
	
	return win;
 }
function openSuitWin(url,name)
 {
	var sw=window.screen.width;
	var sh=window.screen.height;
	var w=sw-300;
	var h=sh-236;
	var x=(sw-w)/2;
	var y=0;
	var win=window.open(url,name,'toolbar=0,scrollbars=1,location=1,menubar=1,resizable=1,status=1,top='+y+',left='+x+',width='+w+',height='+h );
	win.focus();
 }
 
 var last_img_btn_chg_prd=null;
 
function ImgBtnChgPrd_Mouseover(obj,mainpictureurl,largepictureurl)
 {

    if(last_img_btn_chg_prd!=null) 
        last_img_btn_chg_prd.className='img_btn_chg_prd';
    last_img_btn_chg_prd=obj;
    obj.className='img_btn_chg_prd_active';
    
    

    document.getElementById('img_show_prd').src=mainpictureurl;
	document.getElementById('img_show_prd').onclick=function(){ImgBtnChgPrd_Click(this,largepictureurl);}
	document.getElementById('spn_tobig').onclick=function(){ImgBtnChgPrd_Click(this,largepictureurl);}
	
 }

function ImgBtnChgPrd_Click(obj,largepictureurl)
 {
 
  if(arguments.length>1)
     {  
       document.getElementById('hid_largepictureurl').value=largepictureurl;
    }
	var win=openWin('/warm/productPic/gw.htm','preview',700,600);
	win.opener=this;
	   
 }

function suitImage(img,w,h)
{
		var image=new Image();
        image.src=img.src;

		var iw=image.width;
		var ih=image.height;
		var iratio=iw/ih;
        
        if(iw>w)
		{
                iw=w;
				ih=w/iratio;
        }
        if(ih>h)
		{
                ih=h;
                iw=h*iratio;
        }  
        
		if(iw > 0 && ih > 0)
        {    
		    img.width=iw;
		    img.height=ih;
	    }
}