function check()
{
if(document.aspnetForm.ctl00$ContentPlaceHolder1$T1.value=="") {
    alert("Please input Firm Name！");
    document.aspnetForm.ctl00$ContentPlaceHolder1$T1.focus();
	return false;}

   if(document.aspnetForm.ctl00$ContentPlaceHolder1$T5.value=="") {
    alert("Please input Tel No.！");
    document.aspnetForm.ctl00$ContentPlaceHolder1$T5.focus();
	return false;}
	

if(document.aspnetForm.ctl00$ContentPlaceHolder1$T7.value.length!=0)
  {
    if (document.aspnetForm.ctl00$ContentPlaceHolder1$T7.value.charAt(0)=="." ||        
         document.aspnetForm.ctl00$ContentPlaceHolder1$T7.value.charAt(0)=="@"||       
         document.aspnetForm.ctl00$ContentPlaceHolder1$T7.value.indexOf('@', 0) == -1 || 
         document.aspnetForm.ctl00$ContentPlaceHolder1$T7.value.indexOf('.', 0) == -1 || 
         document.aspnetForm.ctl00$ContentPlaceHolder1$T7.value.lastIndexOf("@")==document.aspnetForm.ctl00$ContentPlaceHolder1$T7.value.length-1 || 
         document.aspnetForm.ctl00$ContentPlaceHolder1$T7.value.lastIndexOf(".")==document.aspnetForm.ctl00$ContentPlaceHolder1$T7.value.length-1)
     {
      alert("Invalid email address！");
      document.aspnetForm.ctl00$ContentPlaceHolder1$T7.focus();
      return false;
      }
      }
 else
  {
   alert("Please input email！");
   document.aspnetForm.ctl00$ContentPlaceHolder1$T7.focus();
   return false;
   }
	
   if(document.aspnetForm.ctl00$ContentPlaceHolder1$T9.value=="") {
    alert("Please input Contact Person ！");
    document.aspnetForm.ctl00$ContentPlaceHolder1$T9.focus();
	return false;}
	
	var sum1=0;
	var items1=document.getElementsByTagName("input");
	for(var j=0;j<items1.length;j++)
	{
	    if(items1[j].name.indexOf("ctl00$ContentPlaceHolder1$R1")!=-1 && items1[j].type=="radio")
	    {
	        if(items1[j].checked==true)
	        {
	            sum1++;
	        }
	    }
	}
	if(sum1==0){
	    alert("How Do You Know About Us? ");
	    return false;
	}
    
}