function OpenSheet(sheet_name){

	if (!document.getElementById("sheetlabel")){return;}

    slen = sheetlabel.length;

    if (slen>=1){

        for(i=0;i<slen;i++){

            if (sheetlabel[i].sheetcat_sqno==sheet_name){

                sheethead_left[i].src="/web/images/st_bg_l1_ov.gif";

                sheethead[i].background="/web/images/st_bg_u_ov.gif";

                sheethead_right[i].src="/web/images/st_bg_r1_ov.gif";

                sheetlabel_left[i].background="/web/images/st_bg_l2_ov.gif";

                sheetlabel[i].style.background="#E2E2E2";

                sheetlabel_right[i].background="/web/images/st_bg_r2_ov.gif";

                sheetfoot_left[i].background="/web/images/st_bg_l2_ov.gif";

                sheetfoot[i].style.background="#E2E2E2";

                sheetfoot_right[i].background="/web/images/st_bg_r2_ov.gif";

            }else{

                sheethead_left[i].src="/web/images/st_bg_l1.gif";

                sheethead[i].background="/web/images/st_bg_u.gif";

                sheethead_right[i].src="/web/images/st_bg_r1.gif";

                sheetlabel_left[i].background="/web/images/st_bg_l2.gif";

                sheetlabel[i].style.background="#FFFFFF";

                sheetlabel_right[i].background="/web/images/st_bg_r2.gif";

                //sheetfoot_left[i].background="/web/images/st_bg_l2.gif";

                sheetfoot_left[i].style.background="#CECECE";

                sheetfoot[i].style.background="#CECECE";

                //sheetfoot_right[i].background="/web/images/st_bg_r2.gif";

                sheetfoot_right[i].style.background="#CECECE";

            }

        }

    }else{

        if (sheetlabel.sheetcat_sqno==sheet_name){

            sheethead_left.src="/web/images/st_bg_l1_ov.gif";

            sheethead.background="/web/images/st_bg_u_ov.gif";

            sheethead_right.src="/web/images/st_bg_r1_ov.gif";

            sheetlabel_left.background="/web/images/st_bg_l2_ov.gif";

            sheetlabel.style.background="#E2E2E2";

            sheetlabel_right.background="/web/images/st_bg_r2_ov.gif";

            sheetfoot_left.background="/web/images/st_bg_l2_ov.gif";

            sheetfoot.style.background="#E2E2E2";

            sheetfoot_right.background="/web/images/st_bg_r2_ov.gif";

        }else{

            sheethead_left.src="/web/images/st_bg_l1.gif";

            sheethead.background="/web/images/st_bg_u.gif";

            sheethead_right.src="/web/images/st_bg_r1.gif";

            sheetlabel_left.background="/web/images/st_bg_l2.gif";

            sheetlabel.style.background="#FFFFFF";

            sheetlabel_right.background="/web/images/st_bg_r2.gif";

            //sheetfoot_left.background="/web/images/st_bg_l2.gif";

            sheetfoot_left.style.background="#CECECE";

            sheetfoot.style.background="#CECECE";

            //sheetfoot_right.background="/web/images/st_bg_r2.gif";

            sheetfoot_right.style.background="#CECECE";

        }

    }

    slen = sheetmain.length;

    for (i=0;i<slen;i++){

        sheetmain[i].style.display = "none";

    }

    for (i=0;i<slen;i++){

        if (sheetmain[i].sheet_name==sheet_name){

            sheetmain[i].style.display = "block";

        }

    }

}