function checkmessage(s1){

	s1=trim(s1);

      if(s1.length<=0){

	      alert("Message should not be empty");

	      return false;

      }else if (s1.length>5000){

            alert("Message should not exceed 5000 characters");

            return false; 

      }else{ 

          return true;

      }

 }  



function validatemessage(s1){

	s1=trim(s1);

      if(s1.length<=0){

	      alert("Message should not be empty");

	      return false;

      }else if (s1.length>5000){

            alert("Message should not exceed 5000 characters");

            return false; 

      }else{ 

          return true;

      }

 }  



function trim(s1)

 	{

		s1=ltrim(s1);

		s1=rtrim(s1);

		return s1;

 	}

function ltrim(s1)

 {

	for(i=0;i<s1.length;i++){

		if(s1.charAt(i)==' ' || s1.charAt(i)=='\t' || s1.charAt(i)=='\n'){



		}

		else{

			s1=s1.substr(i)

			break;

		}

		if(i==s1.length-1)

		s1="";

	}



	return s1;

 }

function rtrim(s1)

 {

	for(i=s1.length-1;i>=0;i--){

		if(s1.charAt(i)==' ' || s1.charAt(i)=='\t' || s1.charAt(i)=='\n'){

		}

		else{

			s1=s1.substring(0,i+1);

			break;

		}

		if(i==0)

		s1="";

	}

	return s1;

 }

 function reverse(s1)

 {

	 var r="";

	 for(i=s1.length-1;i>=0;i--)

	 {

		 r=r+s1.charAt(i);

	 }

	 return r;

 }