function checkBox()
   {    var flag=0;
        box=document.forms['subscribe'].elements;
        for(i=0;i<box.length;i++)
	{
	  if(box[i].checked==true && box[i].type=='checkbox')
	  {   
              flag=1;      
	  }
	    
	}
          
        if(flag==0)
          {
	  alert("Select atleast 1 channel");  
          return false;  
          }
	else 
     	 return true;        
        
   }
function select()
 {
        
	var box=document.getElementById('subscription').selectedIndex;
	box=parseInt(box);
       if(box==0)
       {
	  alert("Select frequncy for selected channels");  
       return false;  
       }
	else 
  	 return true;
 }

function Trim(str)
{
  return str.replace(/^\s*(.*\S+)?\s*$/, "$1");
 }
function checkName(uname)
 {
  var Fieldvalue=Trim(uname);
  if(Fieldvalue=="")
      return false;
  else
     return true;
 }
function checkEmail(Email) 
{       email=Trim(Email);
            
        if (/^\w+(\[_|.]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email))	     
            {
           return true;         
            alert("valid")
            }
	 else 
           return false;
}

function validate()
{   
	if(!checkName(document.getElementById("uname").value)){
	       alert("Please enter your name");
           return false;
	}
    if(!checkEmail(document.getElementById("email").value))
        {
           alert("Please enter valid email address");
           return false;
         }
    if(!checkBox())
         {
           return false;
         }
   if(!select())
         {
           return false;
         }
    return true;   
}