function online_shopping(lang) {	  
	  w = 780;
	  h = 500;
	  LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	  TopPosition = (screen.height) ? (screen.height-h)/2 : 0;	  
	  TopPosition = TopPosition - 45;
	  //scroll = 'yes';
	  //settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',toolbar,status'
	  settings = 'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars=yes,toolbar,status'

	  switch(lang) {

	       case 'english' :  if((screen.hieght >= 768) || (screen.width >= 1024))
    	            			var new_shopping = window.open("english/books/index.html","Shopping",settings);
             				 else if((screen.hieght >= 600) || (screen.width >= 800)) {
             				 settings = 'height=500,width=760,top=0,left=0,status,toolbar'
                    			var new_shopping = window.open("english/books/index.html","Shopping",settings);
                    			}
             			     else {
             			            settings = 'height=400,width=620,top=0,left=0,scrollbars,toolbar'
                  		   	    var new_shopping = window.open("english/books/index.html","Shopping",settings);
                  			}
                  			 break;
	       case 'zh_big5' :  if((screen.hieght >= 768) || (screen.width >= 1024))
    	            			var new_shopping = window.open("zh_Big5/books/index.html","Shopping",settings);
             				 else if((screen.hieght >= 600) || (screen.width >= 800)) {
             				 settings = 'height=500,width=760,top=0,left=0,status,toolbar'
                    			var new_shopping = window.open("zh_Big5/books/index.html","Shopping",settings);
                    			}
             			     else {
             			                settings = 'height=400,width=620,top=0,left=0,scrollbars,toolbar'
                  				var new_shopping = window.open("zh_Big5/books/index.html","Shopping",settings);
                  				}
                  			 break;

	       case 'zh_gb2312' :  if((screen.hieght >= 768) || (screen.width >= 1024))
    	            			var new_shopping = window.open("zh_GB2312/books/index.html","Shopping",settings);
             				 else if((screen.hieght >= 600) || (screen.width >= 800)) {
             				 settings = 'height=500,width=760,top=0,left=0,status,toolbar'
                    			var new_shopping = window.open("zh_GB2312/books/index.html","Shopping",settings);
                    			}
             			     else {
             			                settings = 'height=400,width=620,top=0,left=0,scrollbars,toolbar'
                  				var new_shopping = window.open("zh_GB2312/books/index.html","Shopping",settings);
                  				}
                  			 break;


        }
}