function cLetToNum(letter){
	for(var i=0;i<labelLetterArray.length;i++){
		if(letter==labelLetterArray[i]){
			return i;
		}
	}
}
//function to convert column letter to column number
function to convert column letter to column number
function to convert column letter to column number
function cLetToNum(letter){
	for(var i=0;i<labelLetterArray.length;i++){
		if(letter==labelLetterArray[i]){
			return i;
		}
	}
}
function cLetToNum ( letter ) { for ( var i = 0 ; i < labelLetterArray . length ; i ++ ) { if ( letter == labelLetterArray [ i ] ) { return i ; } } }
function to convert column letter to column number
function to convert column letter to column number