function page_check(totPage)
{
	var jumpPage=document.jump_form.p_page.value;
	if (jumpPage=="")
	{
		 alert("跳转页不能为空！");
		 document.jump_form.p_page.focus();
		 return false;
	}
    var v_len=jumpPage.length;  
    for (var j=0;j<v_len;j++){ 
    if ((jumpPage.substring(j,j+1)<"0")||(jumpPage.substring(j,j+1)>"9")) {
        alert("必须输入数字！"); 
        document.jump_form.p_page.focus(); 
        return false;
	  }
	}
	if (jumpPage<1 || jumpPage>totPage){
		alert("跳转页无效！");
        document.jump_form.p_page.focus(); 
		return false;
	}
    return true;
}