//Cookie操作类
Cookie = {
    get : function( name ) {
		var start = document.cookie.indexOf( name + "=" );
		var len = start + name.length + 1;
		if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) ) {
		   return null;
		}
		if ( start == -1 ) return null;
		var end = document.cookie.indexOf( ';', len );
		if ( end == -1 ) end = document.cookie.length;
		return decodeURIComponent(unescape( document.cookie.substring( len, end ) ));
	},
	set : function( name, value, expires, path, domain, secure ) {
		var today = new Date();
		today.setTime( today.getTime() );
		if ( expires ) {
		   expires = expires * 1000 * 60 * 60 * 24;
		}
		var expires_date = new Date( today.getTime() + (expires) );
		document.cookie = name+'='+escape( value ) +
		   ( ( expires ) ? ';expires='+expires_date.toGMTString() : '' ) + //expires.toGMTString()
		   ( ( path ) ? ';path=' + path : '' ) +
		   ( ( domain ) ? ';domain=' + domain : '' ) +
		   ( ( secure ) ? ';secure' : '' );
	},
    del : function( name, path, domain ) {
		if ( getCookie( name ) ) document.cookie = name + '=' +
		   ( ( path ) ? ';path=' + path : '') +
		   ( ( domain ) ? ';domain=' + domain : '' ) +
	        ';expires=Thu, 01-Jan-1970 00:00:01 GMT';
    }
};    
 

/**
 * 按比例缩放图片
 */
function ResizeImage(ImgD,w,h){
	var image=new Image();
	image.src=ImgD.src;
	if(image.width>0 && image.height>0){
		flag=true;
		if(image.width/image.height>= w/h){
			if(image.width>w){
				ImgD.width=w;
				ImgD.height=(image.height*w)/image.width;
			}else{
				ImgD.width=image.width;
				ImgD.height=image.height;
			}
			//ImgD.alt=image.width+"×"+image.height;
		}
		else{
			if(image.height>h){
				ImgD.height=h;
				ImgD.width=(image.width*h)/image.height;
			}else{
				ImgD.width=image.width;
				ImgD.height=image.height;
			}
			//ImgD.alt=image.width+"×"+image.height;
		}
	}
}