function check_form(){

if (dataform.keyword.value=="") {	
alert ("please input keyword!");
dataform.keyword.focus();
return false;
}
return true;

}


function pimsize(imgname,widths,heights){ 
var w; 
var h; 
w=imgname.width; 
h=imgname.height; 
if(imgname.width>widths){ 
do 
w=w-1; 
while (w>widths) ; 
s=w/imgname.width; 
imgname.width=w; 
imgname.height=h*s; 
h=imgname.height 
} 
if(imgname.height>heights){ 
do 
h=h-1; 
while (h>heights) ; 
s=h/imgname.height; 
imgname.width=w*s;
imgname.height=heights; 
} 
}