var arrayId = new Array();
var arraySrc = new Array();
var preload = new Array();
arraySrc[0] = 'images/col2_top_middle_0.jpg';
arraySrc[1] = 'images/col2_top_middle_1.jpg';
arraySrc[2] = 'images/col2_top_middle_2.jpg';
arraySrc[3] = 'images/col2_top_middle_3.jpg';
arraySrc[4] = 'images/col2_top_middle_4.jpg';
arraySrc[5] = 'images/col2_top_middle_5.jpg';
arraySrc[6] = 'images/col2_top_middle_6.jpg';

for(var i=0;i<arraySrc.length;i++){
	preload[i] = new Image();
	preload[i].src = arraySrc[i];
}

function showPhoto(id,num){
	document.getElementById(id).src = preload[num].src;
}