function ckadddemand()
{
if (adddemand.dem_main.value.length >= "300"  ){alert( "請輸入 內容限制為 300個中文字 (包含 標點符號)" );adddemand.dem_main.focus();return false;}	
if (adddemand.dem_conname.value == "" ){alert( "請輸入 聯絡人" );adddemand.dem_conname.focus();return false;}
if (adddemand.dem_pwdvalue == "" ){alert( "請輸入 聯絡人" );adddemand.dem_pwd.focus();return false;}
if (adddemand.dem_conmail.value == "" ){alert( "請輸入 e-mail" );adddemand.dem_conmail.focus();return false;}
if (adddemand.dem_conmail.value !="" && adddemand.dem_conmail.value.indexOf ("@")== -1 ){alert("[ 電子郵件信箱 ] \n格式有誤!!");adddemand.dem_conmail.focus();return false;}	
if (adddemand.dem_contel.value == "" ){alert( "請輸入 聯絡電話" );adddemand.dem_contel.focus();return false;}	
if (adddemand.dem_main.value == "" ){alert( "請輸入 內容" );adddemand.dem_main.focus();return false;}	
	
	}