// function left trim used by trim method to trim the left blank spaces

function ltrim(st)		{
	newString = ''
	for(i=0; i < st.length  ; i++)	{
		if(st.substring(i,i+1)==' ')
		continue;
		else{
			newString = st.substring(i)
			break
		}
	}
	return newString;
}

// function right trim used by trim method to trim the right blank spaces
function rtrim(st)	{
	newString = ''
	for(i = st.length  ; i > 0 ; i--)	{
		if(st.substring(i-1,i)==' ')
			continue;
		else{
			newString = st.substring(0,i)
			break
		}
	}
	return newString;
}

// funtion calls left trim and right trim to trim all blank spaces.
function trim(st)	{
	return rtrim(ltrim(st))
} 

String.prototype.trim = function() {
  return( this.replace(/^\s*([\s\S]*\S+)\s*$|^\s*$/,'$1') ); 
}