String.prototype.trim = function(){


	if(this == '' || this.length == 0){
		return this;
	}


	var start = 0 ; 

	var end = this.length;
	
	var i = 0 ; 	

	while(i <= this.length){


		s = this.charAt(i) ;

		if(s == '\t' || s== ' '){
			
		}
		else{
			
			start = i ; 
			break;
		}

		i++;

	}


	var i = (this.length - 1) ; 		


	while(i > 0) {

		s = this.charAt(i) ;

		if(s == ' ' || s == '\t' ){
			
			i--;
		}
		else{
			end = i ; 
			break ;
		}
	}			


	return 	this.slice(start,end); 

}